Tuning Phased Vertical Antennas


A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9. GP15 Vertical 6m/2m/70cm: COMPACtenna: 6m/2m/440 6m, 2m and 440 MHz Antenna: 10m/2m/440 10m, 2m and 440 MHz Antenna: 20m/2m/440 20m, 2m and 440 MHz Antenna: HamR-7 40m, 20, 10m, 6m, 2m, 220 and 440 MHz Antenna: Cushcraft: Beam Antenna Chart & Index: Vertical Antenna Chart & Index: Diamond: A502HB Yagi Beam 6m: F 22A Vertical 2m: F 23H Vertical. Interaction problems often become too severe. 700 amateur radio topics - 6,000 links & 133 pages - from antennas to zones NOTE: AC6V. ) Properly constructed these antennas are omni-directional and have only one null. The object models a ULA formed with identical sensor elements. A large-scale silicon nanophotonic phased array with more than 4,000 antennas is demonstrated using a state-of-the-art complementary metal-oxide–semiconductor (CMOS) process, enabling arbitrary. Phased Array Antenna. Why is the vertical angle of my antenna important to reception? The best antennas I have found for difficult reception locations are directional Yagi's. I tried 80m on both the vertical and the DXtreme end fed and while both tuned up initially, there were problems when it came time to actually make contacts. Dipole Array---It fits in a skibag Needs on 15 • Directional • Easy to set up • No ground plane • Highly portable • Materials mostly available from current stock • Fair amount of bandwidth "Creating" Gain (A measure of the effectiveness of a directional antenna as compared to a standard nondirectional antenna. However, when tuning co-phased antennas, if you adjust one antenna, it is advisable to adjust the other in equal amounts to keep them in perfect balance. By properly varying the relative phases, it is possible to steer the direction of the radiation. 5m) with additional 72-degree (about 5. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. The antenna "wire" is a transmission line. 66 value : the best is to mesure the Vf with a antenna analyser, results are some surprising (espacialy when you use old coax cables). The slideshow widget is old and has quit working so I will just show a gallery of the pictures. The required directivity pattern is shown in Figure 1. Fracarro LP34 (Inner Metro) UHF/VHF – Horizontal or Vertical mounting option. On the other hand, figure 2. Stacking antennas comes down to: combining two or even more than two antennas together so that they together form an Array. 5; 17 meter monoband vertical at 35ft. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to get information on Antennas: Phased Array. How does a co-phased antennas work? Let’s start off learning first how a ground plane antenna works. Optimum low angle radiation pattern. Hoo boy, I am lost!. Alan Christman proposed a technique for feeding phased arrays based on the impedance transforming nature of transmission lines. I always first tune the antenna for maximum noise on the receiver. At high frequencies, ham radio antennas can be fairly large. The VHF 5/8-wavelength (144 Mhz) vertical monopole has long held the reputation of providing about a 3-dB gain advantage over the 1/4-wavelength vertical monopole. A manual or automatic antenna tuner is required for all CAROLINA WINDOM® Antennas. Universal Magnetic Mount CB Antenna by Hustler Antennas®. There are two types, those that are best installed at ground level and those that can be installed on top of a mast. This Field Day Vertical Antenna project is the result of many years of attending various field day sites and realizing that what was needed is a simple, easy to assemble vertical antenna. 7 dBi gain and 18° Vertical Beamwidth. in E/W favor. AM Broadcasting Radio Engineers dealt with Antenna Phasing to address Daytime and Nighttime Radiation patterns. Transmission Lines. After tuning, the SWR range across the entire band from bottom to top ranged from 1:1. A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9. Simple 3 Element Phased Array Construction Joe Hetrick KC0VKN April 20, 2009 1Abstract The disjoint nature of this document will probably be due to my own failings as a tech-nical author. Both antennas, balun, and ground radials must always be con-nected in parallel for all tuning. Units by Antenna Type; Resonant Verticals; Resonant Verticals. Download Chapter 6 tuning inductor design Last year I posted results from a series of experiments on ground systems for vertical antennas. Our primary coil, The Silver Bullet 1000, is mostly for mobile application by allowing a single antenna for multi-band operation. For an antenna I’ve used a 31 foot vertical and a loop and success will depend on using an outdoor antenna but when away from the home QTH, I’ve heard many of these stations while traveling on the roadways of America, They’re a good break casual AM radio listening. Here’s an easily transportable vertical antenna for 20 meters collapsible to 4 feet that costs about $2. Two verticals, each is 68′ of 16-gauge aluminum fence wire (Princess Auto farm section, $30 for 1,300′ roll) Three elevated 66′-long radials for each vertical. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials. Still, I like verticals. Magnetic mount offering reliable tuning, solid performance and quality construction. Phased Array antennas provide outstanding rejection of multipath reflection signal when receiving vertically polarised signals. This special tip makes tuning the antenna for optimal performance as easy as twisting a small screw. Linear amplifiers will need a high power, wide range antenna tuner. Furthermore, if the return. The array can be fed an any point of any of the verticals. October 08, 2019 in 630m antennas | Permalink | Comments (0) A note on floating short circuited loops for inductor tuning. Page update of 7 August 2019 Over several decades, Barry Booth (W9UCW) and a group of fellow hams, have done an incredible amount of well-documented and systematic, repeated tests to assess the performance of various configurations and installations of short , loaded. A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas. I build last week a Bazooka vertical for the 40m (see link here) with good results. Input power limited by feed line only. Maximum-Gain Radial Ground Systems for Vertical Antennas Al Christman, K3LC Table I Optimum number and length of radials for a vertical antenna on 40 meters (7. Firestik Antenna Company - 2614 E Adams St - Phoenix, AZ 85034 - (Tel) 602-273-7151 - www. Vertical base: 2 separate dipoles: 3*AV1312-2146-174 MHz: 4 dBi/unit: Vertical base: 3 separate dipoles: AV1314-300280-320 MHz: 4 dBi: Vertical base: 1*dipole: AV1314-A300-350 MHz: 4 dBi: Vertical base: 1*dipole: AV1314-L340-440 MHz: 4 dBi: Vertical base: 1*dipole: AV1314-H380-470 MHz: 4 dBi: Vertical base: 1*dipole: AV1419118-137 MHz: 0 dBi: Vertical base: Coaxial dipole: AV1427-390380-400 MHz. The result is 3 db more than just a single antenna. Basic loop tuner 3. This effect is worst on the low bands (40 and below) and less noticeable on the higher bands. Don't laugh!!! It's resonant, has a 1. All Bands Vertical Antenna-HF (homebrew) A few months ago my friend 9W2 AYR(Anuar) and I visited my new friend 9M2LR (Mr. There are even commercially available multiband vertical antennas. What a bad mistake that was! The butternut antenna I once own was a 5 band vertical and work really good considering I did not have any radials down, and did not have the space to put any down. DBJ-2 VHF UHF Dual Band Roll Up portable Antenna. Dual antenna installations: If you're tuning dual antennas, you'll want to adjust both antennas the same amount each time. The dummy load must be capable of handling 5% of the transmitter input power to the PVS-2. In an effort to improve the 17m situation, I contacted Butternut support. However, spacing less than five feet (1. This is an antenna that started out as a 2 element phased array, and grew up to be a 4 square in the Summer 2000 station rebuild. 129 - 2m Vertical Wire Antennas. One reason that this type of vertical antenna is becoming popular is that it can be used across a wide. We supply a mounting plate for the matching transformer with your vertical. 56 sq ft wind load. It also will keep your transmitter happily perceiving a nice 50-ohm feedline impedance that circumvents automatic power reductions that come with high SWR from an impedance mismatch. It is simply a term concocted by the 11m crowd to refer to phased antennas. After reading these two articles, I decided to do an experiment and build a two-vertical phased array for 10 meters. Tuning on all bands is now between 1:1 and 1. Don't Be Phased By Phasing. It's nowhere as good as a beam antenna and it can be a bit noisier than my dipoles, but it allows me to work DX that I couldn't given the low height of my dipoles. Without Radials. I have chosen for a Christman phasing system : simple and easy o build. Its Frequency Range is 26-29mhz and it can be Tuned to most Amateur Bands with a good Tuner. Space alters the pattern and not always negatively. October 1st, 2017. Experimental measurements and calculations show that with this number, the loss resistance decreases the antenna efficiency by 30% to 50% for a 0. C-matcher 600 Watts capacitance type 10-80m. So we need to wind a wire. As you move above or below that frequency their efficiency rolls off, producing standing waves. The problem was that with my hand so close to the tuning capacitor, I detuned the antenna too much which meant that I had to retune quite often. ADS Classic is now deprecated. The examples in Figure 2 are for both elements driven. 58 (included in. Tuning The Antenna: Tuning this antenna was a big pain in the (Butt). Make full use of your sunspot cycle with PATRIOT’s low angle signal. Element tapering or weighting, specified as a complex-valued scalar, 1-by-N row vector, or N-by-1 column vector. 20 Meter Phased Vertical Antenna. This means switching the antenna and we might just as well switch the ATU instead. The new “keeper” 80M antenna is a pair of raised 1/4-wave (68′) verticals in the pine woods on our sloping lower property. So my last post, described a better 15m vertical, which I had some success with. CB Radio Directional Vertical Antenna's Posted on 2012/06/18 by Greg 43AX005 — 2 Comments ↓ Using CB Vertical antenna's co-phased for forward directional extra gain. And even if you can match the antenna. However, when tuning co-phased antennas, if you adjust one antenna, adjust the other in equal amounts to keep them in balance More info on co-phasing antennas. All DXTREME models are a different design that work most efficiently with the length of wire is sold with. 5 to 6 dB improvement as measured on 40m by Rudy Severns N6LF. tuning, we set up a low-power signal source in the field, about 1000 feet away from the antenna and took -meter readings at a receiver located at the antenS na. Prior to tuning it is necessaryto install the 40 meter short­ ing clip to short out 7 turns of the top(40 meter) coil. 40m is my next project/goal to improve station performance on. Short of simply pressing "TUNE" on my rig's internal antenna tuning system and living with the high SWRs, I really wanted to try something a bit more… shall I say… clever. The small single turn magnetic loop (SSTML) antenna consists of a single winding inductor, about 3 feet (1 meter) in diameter, and a tuning capacitor. The antenna acts like a stacked pair on the vertical and a standard yagi on horizontal. 5-54 Mhz, 5kW. IZ5 L J B www. The user for maximum efficiency manually adjusts the high Q SuperCoil SuperSlider tuning. Collinear-phased 5/8 wave elements. Vertical base: 2 separate dipoles: 3*AV1312-2146-174 MHz: 4 dBi/unit: Vertical base: 3 separate dipoles: AV1314-300280-320 MHz: 4 dBi: Vertical base: 1*dipole: AV1314-A300-350 MHz: 4 dBi: Vertical base: 1*dipole: AV1314-L340-440 MHz: 4 dBi: Vertical base: 1*dipole: AV1314-H380-470 MHz: 4 dBi: Vertical base: 1*dipole: AV1419118-137 MHz: 0 dBi: Vertical base: Coaxial dipole: AV1427-390380-400 MHz. This calculator was adapted from the Coil-Shortened Dipole Antenna Calculator. In order to achieve the goal of usability, you will want to tune. Even when the element pattern is well understood, as is the case with a dipole antenna, the mutual coupling among the elements can significantly change the. Odd numbered vertical arrays are best fed (for balance) at the center point of the center vertical,. Both antennas favor the E/W direction and were about 80ft. However, spacing less than five feet (1. 80m Mobile Antenna Analysis. Low Band DX Antennas •Lets go from easiest to hardest antennas to put up on the low bands •SteppIR CrankIR -no radials •Shortened vertical dipole (using loading coils and "T ar hats") -no radials •On 40M and 30M a dipole up 50' or more is a good antenna •Single vertical using an UNUN or current choke and radials. How does a co-phased antennas work? Let’s start off learning first how a ground plane antenna works. This, alas, is the vertical antenna quandary One can see how the maxi-loss vertical takes it hard on all three counts. This antenna is 58 ft tall and is mounted on a hinged base. It all depends on what you are comparing the performance to. In antenna theory, a phased array usually means an electronically scanned array, a computer-controlled array of antennas which creates a beam of radio waves that can be electronically steered to point in different directions without moving the antennas. I lack any kind of directivity and "punch" on 40, 80 and 160 meters here at N5OE. All Bands Vertical Antenna-HF (homebrew) A few months ago my friend 9W2 AYR(Anuar) and I visited my new friend 9M2LR (Mr. There is also an appendix on Anntenna Matchbox selection and another on Baluns, including how to build your own simple and effective balun. 40m, fed buy a separate coax. Running in and out of the shack to the rig to the antenna. Here’s an easily transportable vertical antenna for 20 meters collapsible to 4 feet that costs about $2. Resources listed under Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. 56 sq ft wind load. I cut a quarterwave radial wire for each of the following bands: 80, 40, 30, 20, 15 metres. Input power limited by feed line only. Vertical stacking will reduce the vertical beamwidth and also will introduce extra sidelobes in the vertical (elevation) radiation pattern. The term "co-phased" is a misnomer. What is tuning a CB antenna? You are tuning the antenna to your vehicle/application. Maco V58: 26-33 Mhz 5/8 Wave Vertical Antenna with Ground Plane - 1200 watt power handling capability. Parnell, “Use your tower as a dual band, low band DX antenna, QST, Vol. A vertical HF antenna offers many advantages—an omnidirectional signal collector and easy to install radiator are two of the biggest. 5 kW rating. But they use traps which introduce yet another set of lossy components in the equation. - Jay Terleski, WX0B I often get asked about how to match a ¼ WL vertical to a 50 ohm transmission line and what to do about lightning protection and even how to make RF measurements in the presence of strong AM broadcast RF on the antenna. 125 MHz, how long would it be? 3. A flimsy and rather poorly made plastic cover protects the tuning capacitor and its motor and the coupling coil from the elements, if the antenna is mounted outside, but it seems designed more to let rain run out than to keep it out in the first place. is the ARRL Antenna Handbook. As you pull the main tuning rope the antenna tunes across the 40m band and then somewhere up around 7400kHz, the extra slack is gone, the LEGO/Powerpole switch closes and the tuning jumps to the 30m band. 160-meter antenna should be tuned first, before tuning the 80-meter ver-tical. The radiation pattern of a vertical dipole is a 360 degree pattern around the main radiator. The formula for calculating the approximate length of a quarter-wave vertical antenna is:. DIAMOND CP-5HS 7 / 14 / 21 / 28 / 50 MHz Trap Vertical Antenna 40 / 20 / 15 / 10 / 6 Meters 11. If you need to adjust for resonance do it by changing the wire vertical part, leave the radials alone for the moment. For example, AM broadcast radio antennas consisting of multiple mast radiators fed so as to create a specific radiation pattern are also called "phased arrays". Unless you are using a simple antenna, like a resonant 1/2 wavelength wire (commonly called a dipole), your antenna consists of phased elements. Close-spaced phased arrays exhibit useful directivity characteristics for reception of skywave signals. You do this by adding or removing small inductors in series with a main inductor, or by adding or removing turns. The quarter wave vertical antenna is the simplest form of vertical antenna. Universal Magnetic Mount CB Antenna by Hustler Antennas®. Founded in 2001, SteppIR provides the most diverse set of horizontal, vertical and portable antennas. The basic antenna. The radiating elements might be dipoles pen-ended waveguides. ADS Classic is now deprecated. Gain is due primarily to the low angle radiation pattern. 2:1 at band center. 5077 Model G3-144 The G3-144 is the newest addition to the Hustler Base Station line. Radar Course JSH -3 T R Radar Antenna Architectures Vertical. Subject: 2 meter dipole antennas Date: Mon, 10 Sep 2007 12:45:54 -0500 From: Bain Adam To: Tony W4ZT Tony, I built a phased array using four of your dipoles. On a background there are verticals of 80m phased system - 4 square. The antenna acts like a stacked pair on the vertical and a standard yagi on horizontal. Very simply, it is a full wave off center fed at a quarter wave folded down vertical at the quarter wave of each end. High Performance 40 Meters Vertical. Project: Phased Vertical Array I've been thinking about the most effective antenna I could build for 40 meters. antennas to provide usable communications? Even better, what if an antenna never needed tuning or adjustment on any frequency in the HF spectrum? Comet Antennas has released their new CHA-250B HF vertical antenna – a straight, aluminum pipe with no parasitic elements, designed for continuous (no gaps) transmit coverage from. 5kW antenna tuning unit. Techniques for tuning a crossed-field antenna are provided. That's 72 feet of tower and antenna being tilted over on a 1. Antenna Overview. Page 121 of MFJ new 2013 ham catalog Hy-Gain’s PATRIOT HF vertical antennas are the best built, best performing and best priced multiband verticals on the market today. 2014 OH1TV 2 2 over 2 phased array for 40m • Upper antenna up 46m, lower ant 26m - vertical spacing 20m - coil loaded elements, 72% of full size -Those band tuning coils are easily. Linear amplifiers will need a high power, wide range antenna tuner. It is made from 1/4" thick aluminum plate and 1" thick aluminum blocks (which were easy to machine). It is needed at least two spacer to build the antenna. HD-QUAD: Bringing the power and efficiency of roof-top High-Gain Phased Array Digital HDTV antenna indoors. Co-phasing involves placing two (or more!) identical antennas either side-by-side or one over top another (“stacking”) at a certain distance apart (usually a 1/2 Wavelength or more) and feeding the antennas in-phase. I would provide the article, but copyright forbids me from doing so. CB antennas are usually pretty cheap and shoddy - not THIS antenna! Some aluminum verticals are a pain to put together - not THIS antenna! Not only does it perform wonderfully on 10, 11, 12 and 15 meters but it is QUIET!!! I didn't cut it to tune it, I left it just like I bought it and assembled it in less than 15 minutes upon arrival. 5 kW rating. Fine tuning your Multiband Hustler Vertical. A flimsy and rather poorly made plastic cover protects the tuning capacitor and its motor and the coupling coil from the elements, if the antenna is mounted outside, but it seems designed more to let rain run out than to keep it out in the first place. When antennas are stacked only vertically, the horizontal radiation pattern of the array will be the same as the individual yagis. This high power antenna handles 5000 watts of power, and is insulated up to 14,500 volts. Included are two 6" pieces of 16ga copper wire to assist in tuning antenna coils. 4; 20 meter diamond shaped quad loop at 40 ft. A BRIEF GUIDE TO THE BUDDIPOLE SYSTEM Welcome to the Buddipole antenna system, a unique, capable and adaptable antenna system for a wide range of applications. However, we must tell you that tuning this antenna is tedious. com is an archive of Rod/AC6V's webpages, and is no longer being updated. Phased array consisting of N lined up individual isotropic antennas with the composite main antenna beam into vertical direction. Featured Antennas. The 03MM-BIGRAY does a great job of showing what a 16-element antenna can do. By John Portune W6NBC. - Volume 122. Nanoscale antennas, etched in chip, provide precise control of light Nanophotonic phased array has many applications in communications and medicine. Each HF band + 6M has it's own tuning stub. Vertical HF antennas do have their merit though. An antenna in the form of an asymmetric dipole was proposed by the inventor of radio, A. Average Elements distance is about 63 degree. Well-known in the CB radio industry, Firestik is one of few CB/HAM radio antennas and antenna mount kits that operate with a no ground plane. What a bad mistake that was! The butternut antenna I once own was a 5 band vertical and work really good considering I did not have any radials down, and did not have the space to put any down. QST May 1993, p. There is great satisfaction in building rather than buying. High Performance Receiving Antennas 10 - 14 dB RDF ⚫ 10 dB: 500 to 600 foot Beverage about 7 feet high ⚫ 11 dB: Two or three close spaced 500 to 600 foot Beverages, staggered 125 feet ⚫ 11 dB: Vertical Waller Flag array ⚫ 12 dB: 4 square array of active or passive short verticals 80 x 80 ft ⚫ 12 dB: 3 element YCCC tri-band array of short active verticals 120 ft long. All you need is one beverage bottle. Download 630-2200m N6LF TX antenna. 7 dBi gain and 18° Vertical Beamwidth. 5 kW automatic tuner. Without Radials. The "the Hairpin Match" is a simple and easy way to fix this problem. However, spacing less than five feet (1. 1 GHz and at 1. Phased array antenna systems are well known, one application being electronic steering of a beam for a tracking radar system. The origin of the local coordinate system is the phase center of the array. The Half Square antenna is a wire antenna with two vertical radiators fed in phase. The center lead of the coax forms one half of the dipole and the braid forms the other. Stacking antennas comes down to: combining two or even more than two antennas together so that they together form an Array. Signal flutter is reduced and reception is vastly improved. With a little shortening, the match was <1. 3200 Meters of 1. Magnetic Field q f r. The W6LVP mag loop is a complete receive antenna system delivering top-of-the-line performance to amateur radio operators and SWLs – particularly for those with space and/or budget limitations. An antenna array (often called a ' phased array ') is a set of 2 or more antennas. , Manufactures of the Challenger, Titan, Eagle, Voyager, and the New Mono GAP vertical HF antennas and accessories including the Quick-Tilt Mounts for the amateur radio community and more!. The term "co-phased" is a misnomer. These antenna types are adjusted by changing the length of the radiating element(s). The antenna itself is an off-center fed vertical dipole made by flipping an electrical quarter wavelength of braid back over the outside of the coax. Move the shorting wire on the tuning coil until you get a good match, and you are on the air. Here is a slideshow of my 20 meter phased verticals. The graph below shows the measured VSWR of a 6. Makes it easy to work on by yourself, no need to call your ham buddies over to help take it down an. On a previous project linked here, a new vertical phased array switch box was completed. A Closer Look at Vertical Antennas With Elevated Ground Systems Rudy Severns N6LF. Attention to detail is paramount… Requires MILES of wire for ground. The finished system performs well and has very good Front to Back nulls. But I had plans on building some other antenna. To quote a Firestik page "Some people believe that co-phased antennas must be separated by a minimum of nine (9) feet. To say the least, I believe most vertical antennas are a compromise to begin with. The counterpoise wires are cut 5-10% longer than the antenna wire, and are used to support the antenna. 6:1 continuously from 3. While 1/8th wave works reasonably well, better coverage is obtained if the antenna is mounted at about 1/20th wavelength above ground. Author(s): Ho, Kevin Ming-Jiang | Abstract: The thesis comprises of 3 projects; an L-band microstrip antenna with frequency agility and polarization diversity, X-band phased array antennas incorporating commercially packaged RFIC phased array chips, and studies for Ku/Ka- band shared aperture antenna array. Its counterpoise is the lower half of the antenna (ground). - Assembled in 20 minutes by two persons. However, unless the antenna is mounted a substantial distance from the real ground ( IE , more than ½ wavelength) the ground still has an effect on the radiation characteristics of the antenna system. The user-defined pattern has a sine pattern in the azimuth direction and a cosine pattern in the elevation direction. IC-706 Screwdriver Tuning. Combining 2 verticals with 2 elevated radials each and 3 pieces of coaxcables gives you a phased vertical. 8 dB of gain over a single element. The item most overlooked when ordering a custom radio is the microphone. THE 80M ANTENNA The current Antenna system in use here on 80M is a 3 Element,in line, phased vertical array, made from wires and strung up in Oak trees and fitted with a reasonable but not extensive ground radial system. 2:1 at band center. It is simply a term concocted by the 11m crowd to refer to phased antennas. This vertical antenna has no lossy traps,coils or stubs to burn out ,fill up with water and detune. Rudy goes on to say, The ground system around the antenna does nothing for the far-field pattern except to increase the power radiated for a given input power. 88 shipping. 0 MHz rated at 2 KW (SSB) The DXTREME models are the ultimate end-fed antennas with the capability of covering from 160-6 Meters and able to handle legal limit power handling with ease. 80m Mobile Shootout Results. But 3 db of gain will hardly be noticeable to anyone listening to your signal, so why bother? The threshold in antenna cost verses performance gain is around 6 db. By feeding equal amounts of power that arrive at each dipole at the same instant, the dipoles radiate "in phase," or in synchronicity, for improved gain by virtue of its pattern. ULA creates a uniform linear array (ULA) System object, H. The design of this Field Day Antenna is not very novel and leverages ideas from Butternut verticals and ARRL publications. A physically short broad-bandwidth multiband vertical antenna with 50 ohm input impedance and 25 foot square footprint for 160, 80, 40 and 17 meter radio bands. 5m) to the northern vertical (the front element). We build quality antenna coils that are easy to tune and easy to install. Our coil coupler slides up and down the coil for easy matching. 185 so they were 32 ft of #14 insulated wire. Tapers, also known as weights, are applied to each sensor element in the sensor array and modify both the amplitude and phase of the received data. Suppose you place a radar antenna near a reflecting surface, such as the earth's land or sea surface and computed maximum detection range. The mast you should use depends on your soil conditions. - Jay Terleski, WX0B I often get asked about how to match a ¼ WL vertical to a 50 ohm transmission line and what to do about lightning protection and even how to make RF measurements in the presence of strong AM broadcast RF on the antenna. I don't like this name, and would prefer to call it a "shunt match" because it. 2 copper tubing 27. This review of the Challenger DX Antenna by GAP Antenna will not be a highly technical review, it will be performance based, using my existing antennas for comparisons First off, what is the GAP Challenger, and how does it work? You must be an ARRL member to get the QST article covering that, it is in the January 1995 issue. High Performance Receiving Antennas 10 - 14 dB RDF ⚫ 10 dB: 500 to 600 foot Beverage about 7 feet high ⚫ 11 dB: Two or three close spaced 500 to 600 foot Beverages, staggered 125 feet ⚫ 11 dB: Vertical Waller Flag array ⚫ 12 dB: 4 square array of active or passive short verticals 80 x 80 ft ⚫ 12 dB: 3 element YCCC tri-band array of short active verticals 120 ft long. The words antenna and aerial are used interchangeably. I tried 80m on both the vertical and the DXtreme end fed and while both tuned up initially, there were problems when it came time to actually make contacts. 20 Meter Phased Vertical Antenna. Also in my research I found out that 6m FM repeaters are vertically polarized antenna so best to operate a vertical antenna as well. Cebik, W4RNL Many antenna builders cringe at the mention of a certain word: phasing. However, we must tell you that tuning this antenna is tedious. It’s a non-resonant 43-foot tilt-over mounted on a 2″ pipe set in concrete. The user-defined pattern has a sine pattern in the azimuth direction and a cosine pattern in the elevation direction. Download 630-2200m N6LF TX antenna. over a range of Frequencies. 2014 OH1TV 2 2 over 2 phased array for 40m • Upper antenna up 46m, lower ant 26m - vertical spacing 20m - coil loaded elements, 72% of full size -Those band tuning coils are easily. by Graham Maynard. AM Broadcasting Radio Engineers dealt with Antenna Phasing to address Daytime and Nighttime Radiation patterns. I had a GAP Titan DX antenna installed on the house for 10 years, took it down to build a garage, and replaced it recently with a new Gap Titan DX. The dual-feed planar inverted F-antenna (PIFA) has two operating frequencies which are independently tuned at 0. Firestik is one of the top manufacturers of CB/HAM radio antennas, coax cables, and antenna mounting kits. [ Up ] [ Experimental Vertical ] [ Loop Antenna ] Vertical Antennas for 136 kHz This page describes the simple vertical antennas used at GW4ALG. Like all inverted vees, it requires a single center support, which is often times a tower which is topped with a Yagi or quad for the upper bands. Most mobile CB antennas these days are quite short with a hefty base loading coil. 97 - Morgain-Dipole Antenna for 160m and 80m 128 - 5-Element Log-Periodic Vertical Antenna for 80m, 40m, 20m. Low Band Vertical parts list 1 2 1 1 1 1 1 66 feet 1 Buddipole component Nr Antenna arm Whip Low band coil ' BUDDIPOLE TM LOW BAND VERTICAL FOR. Since remotely adjusting an antenna while driving could be dangerous, I included fully automatic tuning, commanded from the transceiver. I don’t use the antenna calculators online, they are always wrong or only somewhere near your frequency. 25" screw mechanism at the 4 foot level. hi,good to see people building there own antennas,i have been running 40m phased verticals for 3 years they aregreat,i started off with ground mounting but took advice from an american friend and raised the feed point with elevated radials,you think your vertical is good now try elevating it it makes an amazing difference and you only need 4 radials. This means that modifying the settings on one band will influence the others. Each antenna element is illuminated by two NEO Pixels, where this is a dual-polarized phased array using one LED for vertical and another for horizontal polarization. 3 ft Vertical- A better Antenna for 15m. 26-33 Mhz 5/8 Wave Vertical Antenna with Ground Plane - 1200 watt power handling capability. The fishing pole is not the antenna; it's just a prop that holds the wire up. The antenna presented here covers all ham bands from 40 to 10 meters, and everything in between, with a maximum SWR of no more than 1. One of the cautions you sometimes see in discussions of the end-fed antenna are "avoid multiples of a half wave. I realized I’d have to come up with a better system for setting it up—perhaps an old tripod modified to accept the fishing pole, or something else. HF Vertical Antennas and Packages. Not having a lot of room for 40 meter beams, I decided to use the space I do have, which is a long wooded fence in the backyard. Phased arrays have been used for years in military radars for long range detection of missiles. Vertical stacking will reduce the vertical beamwidth and also will introduce extra sidelobes in the vertical (elevation) radiation pattern. Super wide bandwidth means more time operating ,and less time stuck on a frequency your trap vertical is tuned for. Assume the operating frequency is. The measured. Model 1115di - 1:1 Dual Core Isolation Balun, 1. They make a great combo. Figure 2 shows the design of the antenna. 2 shows the maximum radiation pattern where antennas are fed in phase and are one-half wavelength apart. I build last week a Bazooka vertical for the 40m (see link here) with good results. • AN/SMQ-11 shipboard antenna: 1. tall! The HF9V antennas are easy to erect and tune antennas that will last you for many years. This configuration is ideal for medium range 80 meter contacts and it is a reasonable performer for working DX, in spite of its compact size. Most mobile CB antennas these days are quite short with a hefty base loading coil. INTRODUCING THE. Make full use of your sunspot cycle with PATRIOT’s low angle signal. An antenna array (often called a ' phased array ') is a set of 2 or more antennas. But they use traps which introduce yet another set of lossy components in the equation. Linear loading for vertical antenna ("Flagpole antenna") Shortened vertical for 40m (2/4 height) Short helically wound vertical for 20m; Short helically wound vertical for 160m; Short (2m) indoor multiband vertical antenna Half-square (phased verticals) One from Hy Power Antenna Company, premaid "Using the Half-Square Antenna For Low-Band DXing. Installed 6M Cushcraft Ringo AR-6 Vertical I notice my AT600ProoII tuner can only tune the Endfed on 6m band at aprox. Model 1115di - 1:1 Dual Core Isolation Balun, 1. I have always wanted a good 40 meter beam… Cons: Cost is high, probably around $1000 for everything. The antenna acts like a stacked pair on the vertical and a standard yagi on horizontal. Attach them (screw) to a small copper plate at the proposed antenna base, close to the co-ax cable. 58 (included in. 4 dB gain over a dipole. In order to achieve the goal of usability, you will want to tune. I made contacts easily and the exchange was copied 100% about 95% of the time. Graphics by G8ODE DEC 2010 iss 1. As a starting point, it's best to put the tuning screw either all the way in or out, so each antenna is the same length. Coherence Tuning in Optically Coupled Phased Vertical Cavity Laser Arrays Stewart T. Collinear-phased 5/8 wave elements. This invention relates to a method for tuning a phased array antenna, and more particularly to a method of adjusting for differences in the effective lengths of the transmission lines to the elements of a phased array. CB Radio Directional Vertical Antenna's Posted on 2012/06/18 by Greg 43AX005 — 2 Comments ↓ Using CB Vertical antenna's co-phased for forward directional extra gain. You can further reduce the height of the antenna by placing a capacitance "hat" at the top. This antenna is EXTREMELY easy to assemble, requires no tuning or adjustments and VSWR is under 1. They are kept vertical by PVC bases. Big Hair Antennas range from 5' to 50' feet in length, and are made to handle very serious power with the highest efficiency and gain. Physical Demands of CB Antennas As 27 MHz is a relatively long wavelength for mobile communications, the choice of antenna has a considerable impact on the performance of a CB radio. Collinear-phased 5/8 wave elements. So it will come in handy. The 34-foot, 22-ga. We didn’t have an antenna analyser to further adjust lengths, all had to be fixed by experimentation. Both antennas, balun, and ground radials must always be con-nected in parallel for all tuning. Fine adjustments can be made by squeezing or spreading turns on the main loading coil's form, if it is a toroid or non-potted construction. The basic antenna. Among amateurs there's been a long running discussion regarding the effectiveness of avertical with an elevated ground system compared to oneusing a large number of radials either buried or lying on the ground surface. The AEA put out a clean, stable signal that worked well for this. My antennas are designed for 7. However, spacing less than five feet (1. 20 Meter Phased Vertical Antenna. Vertical Antenna Tilting. Since I've been pretty satisfied with the performance of my 40M tree-mounted wire vertical, I wondered if there was some way to get another vertical mounted nearby and use the two as a phased array. Select options. You'll hear them referred to as a "vertical phased array" or a "horizontal stacked array". MFJ MFJ-2389 Vertical Compact 8-Band 80-2M + UHF, 200W PEP. The counterpoise wire is an important part of tuning the antenna. Rappaport, J. Don't laugh!!! It's resonant, has a 1. We didn’t have an antenna analyser to further adjust lengths, all had to be fixed by experimentation. 20 Meter Phased Vertical Antenna. In order to tune the beamformer actuators of these earlier phased array antenna systems, either a manual tuning procedure was used [2], [3], which is only possible for a small. 3200 Meters of 1. Adjust the SWR to the desired band segment, then use an antenna tuner to TX outside of the 2:1 or less band-width. Everywhere we look, everything tells us the 5/8th wave has 3dB gain. Phased Array Digital TV Antenna Vertical/Horizontal With Balun 16 Elements 03MM-BIGRAY. Johnson, and Kent D. <= Back to Dayton New Products Hy-Gain 80-6 Meter Patriot Vertical Antenna AV-680, $549. If the antenna reads too long, adjust the element shorter. The most basic antenna is called "a quarter wave vertical", it is a quarter wavelength long and is a vertical radiator. Linear loading for vertical antenna ("Flagpole antenna") Shortened vertical for 40m (2/4 height) Short helically wound vertical for 20m; Short helically wound vertical for 160m; Short (2m) indoor multiband vertical antenna Half-square (phased verticals) One from Hy Power Antenna Company, premaid "Using the Half-Square Antenna For Low-Band DXing. Super wide bandwidth means more time operating ,and less time stuck on a frequency your trap vertical is tuned for. Short of simply pressing "TUNE" on my rig's internal antenna tuning system and living with the high SWRs, I really wanted to try something a bit more… shall I say… clever. Each HF band + 6M has it's own tuning stub. When tuning co-phased antennas (dual), it is best to adjust both antennas an equal amount to maintain equality in their individual resonant frequency. A fellow hammer came over yesterday with an antenna analyzer and did confirm the problem is the Matching Network box, antennas dead throughout all bands. Both antennas favor the E/W direction and were about 80ft. Fine tuning your Multiband Hustler Vertical. The same applies for (2) vertical polorized antennas side by side. 20m, 17m, 15m, 12m, 10m, fed by a second coax. On a background there are verticals of 80m phased system - 4 square. 98 - ZL-Special for 20m, 15m, 10m. An antenna array (often called a ' phased array ') is a set of 2 or more antennas. When building Low Band Vertical antennas, or even Inverted-L antennas for 160/80m, you will often find that the feedpoint impedence is much lower than the theoretical value of 36 Ohms. ALL STAINLESS HARDWARE End Fed Dipole 80-6M Portable HF Matchbox. Then, based on your SWR readings, length or shorten BOTH antennas the same amount each time. Heavy duty trunk lip mount features 180 degree swivel ball for vertical positioning. ) Properly constructed these antennas are omni-directional and have only one null. It all depends on what you are comparing the performance to. The fishing pole is not the antenna; it's just a prop that holds the wire up. Featured Antennas. Don't trust to much the clasic 0. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to get information on Antennas: Phased Array. Tuning the Fishing Pole Ear. 80 meter Sloper array a 2 or 3 element horizontal array would beat out Joe's antenna, and all the vertical arrays for that matter. The same applies for (2) vertical polorized antennas side by side. Even when the element pattern is well understood, as is the case with a dipole antenna, the mutual coupling among the elements can significantly change the. 66 value : the best is to mesure the Vf with a antenna analyser, results are some surprising (espacialy when you use old coax cables). Tuning Part 2. Ending Feb 16 at 1:15PM PST. 3 Element 40m Vertical Parasitic Array (VPA) Vertical Yagi Essentially, this is a single 1/4 wave vertical antenna with ground radials, complimented by a pair of parasitic verticals; a reflector and a director. Why is the vertical angle of my antenna important to reception? The best antennas I have found for difficult reception locations are directional Yagi's. £135 ISBN 978-1-63081-029-. I have always wanted a good 40 meter beam… Cons: Cost is high, probably around $1000 for everything. The Co-phased dual antenna will allow the use of two identical antennas on your car or home, or. So it was created antenna without any spacer. This antenna is the phased array: a group of antennas that work together to provide some significant benefits and capabilities not available with the simple antennas we know. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to get information on Antennas: Phased Array. 630m tuning will be added in due course. The Christman Feed. Roeloffzen Advisors: dr. xvii; 530pp. The big difference between phased antennas and co-phased antennas is one exists and the other does not. It uses 4 top-hat. Harwich tests was noted again with similar antennas during DXpedition activity at the salt-marsh site in Rowley, MA on several subsequent occasions. Vertical Antennas Phone: 940. Let's start with the operation of a 1/2 wave dipole. Among amateurs there's been a long running discussion regarding the effectiveness of avertical with an elevated ground system compared to oneusing a large number of radials either buried or lying on the ground surface. For any given combination of transmitter power and vertical antenna size, your range at 1600 kHz could be up to 10 times greater than your range at 530 kHz. Supplied with 17' of top quality low loss coaxial cable (connector installed). GAP Titan DX Multiband Vertical Antenna. Conventionally, a radio frequency (RF) phase shifter, which is typically used to dynamically adjust the phase of antenna elements, is a key component for steering a narrow beam pattern of a phased array antenna toward the desired signal in a beam‐steering antenna system [Parker and Zimmermann, 2002a, 2002b; Hwang et al. 2 el phased vertical for 40 meters. Powered by our patented technology that provides the highest quality and most reliable system on the market, we are pleased to support your communication needs. I made contacts easily and the exchange was copied 100% about 95% of the time. Super Vertical HF Antenna. It can be switched East/West and provides excellent performance across N America and long path to the Pacific. The Unit switches 2 band on 160m and 2 band on 80m (cw and phone sections). On top of that, the antenna performs extremely well, is made in the USA exclusively from American materials, and comes with a five-year warranty. Attention to detail is paramount… Requires MILES of wire for ground. Extra tough for use on hard tops, T-tops, radar arches, or wherever its extra resistance to high winds and high speeds is welcome. 3 Element 40m Vertical Parasitic Array (VPA) Vertical Yagi Essentially, this is a single 1/4 wave vertical antenna with ground radials, complimented by a pair of parasitic verticals; a reflector and a director. Make sure to install cable ring terminals at the end of each wire. Horizontal or vertical polarization of an cubical QUAD-Antenna is determined by placement of the feed point (feed gap on the driven element) - Parasitic elements need to be mounted in the same orientation as the driven element. Download Chapter 6 tuning inductor design Last year I posted results from a series of experiments on ground systems for vertical antennas. Fast & Free shipping on many items!. First practical antenna. The vertical collinear antenna design transformed from the theoretical pair of phased dipoles a), into a pair of dipoles driven in series from a single source and phased with a section of transmission line b), to finally c), the practical design that uses the outer conductor of the feed lines as the lower three radiating elements of the antenna. 5, May 2019, pp. Model 1110 - QRP 1:1 Isolation/Choke balun 1. All Bands Vertical Antenna-HF (homebrew) A few months ago my friend 9W2 AYR(Anuar) and I visited my new friend 9M2LR (Mr. The squares can be fed broadside (45 and 255 degrees) or end fire (135 and 315 degrees). VK1OD Theme page: Antennas. Closed Vertical Arrays (CVA) have their origin in the bobtail curtain. 70 shipping. The 80 meter inverted vee is a common and classic antenna. if the yagi is vertical the array is stacked horizontally (across from each other), or if the yagi is horizontal the array is stacked vertically (above the other). Element tapering or weighting, specified as a complex-valued scalar, 1-by-N row vector, or N-by-1 column vector. This antenna tuner will match end-fed half-wave vertical or inverted-L wire antennas to low impedance transceivers or coaxial cables with high power-transfer efficiency. Much easier to make the radials the right length and tune the vertical section. A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas. 4; 20 meter diamond shaped quad loop at 40 ft. The most popular book on antennas ever written, widely known as "the antenna builder's bible," Joseph J. Top loaded wire phased vertical-- The MINI CURTAIN or HALF SQUARE It is amazing to find a little used wire antenna with enormous utility , simplicity and gain. Determine the direction you want the array positioned. Dipole Array---It fits in a skibag Needs on 15 • Directional • Easy to set up • No ground plane • Highly portable • Materials mostly available from current stock • Fair amount of bandwidth "Creating" Gain (A measure of the effectiveness of a directional antenna as compared to a standard nondirectional antenna. Tuning any one of the family of Spider Antennas is very easy. The array can be fed an any point of any of the verticals. Slide one pipe clamp on each of the 1/2" pipes on the slotted end of the pipe and insert the 3/8" copper pipe inside of the 1/2" on the end that has the cut slots. Harwich tests was noted again with similar antennas during DXpedition activity at the salt-marsh site in Rowley, MA on several subsequent occasions. It still functions like a dipole, but the other half of the antenna is a “Virtual” or imaginary antenna that resides within the antennas ground system. 40 Meter Phased Verticals-1/1. Overview: I thought I would share a few of my notes on tuning up a 6BTV, (review of the DX Engineering 17 meter add on kit here), antenna, and constructing a radial field. Trim each vertical to the desired frequency. Project: Phased Vertical Array I've been thinking about the most effective antenna I could build for 40 meters. Depending on the application, practical phased antenna arrays sometimes use specially designed antenna elements whose radiation pattern cannot be represented by a closed-form equation. DBJ-2 VHF UHF Dual Band Roll Up portable Antenna. The goal was to keep it under 9. 80m Mobile Antenna Analysis. By continuing to use PCTEL websites, you consent to the use of cookies in accordance with your browser’s settings. This antenna is 58 ft tall and is mounted on a hinged base. verticals). The N6BT DXU-32 … I have had two occasions where I was able to test my fantastic 40M phased vertical array against other antennas. 5m) with additional 72-degree (about 5. 20 Meter Phased Vertical Antenna. Up to 100 kHz. Antenna Projects From The YCCC-- Click On Articles-- Double-L For 80/160, Two Wire Beverage, A Poor Man's 160 Meter 4-Square, Using a 4 square Vertical Phased Array to improve your 80 and 160 meter signal, -- From The Yankee Clipper Contest Club. An internationally acclaimed antenna design, Butternut HF9V antennas include a 1 1/8 in. With a little shortening, the match was <1. Metasurfaces, a new class of artificial media attracting great research interest, are composed of a two-dimensional ensemble of designer optical antennas arranged with subwavelength separation that introduce spatially-varying optical properties (e. In this series, we look at the new […]. It is made from 1/4" thick aluminum plate and 1" thick aluminum blocks (which were easy to machine). $\begingroup$ I guess a better answer would have included all kinds of exceptions for autotuners, longwire or other specialized antennas, etc. The item most overlooked when ordering a custom radio is the microphone. Or, an antenna analyzer can be used to speed up the process. The auto-tuner would start trying to re-tune every time I went to transmit. 107/ 15 ft for the RG58 coax. A visual observer would see only part of one. Connect a 50-ohm dummy load to the load port. Keep up the good work and enjoy the hobby,best 73s de chris GM4ZJI. 20 Meter Phased Vertical Antenna. Attach them (screw) to a small copper plate at the proposed antenna base, close to the co-ax cable. And even if you can match the antenna. 56 sq ft wind load. 160-meter antenna should be tuned first, before tuning the 80-meter ver-tical. Assume the antenna operates at a frequency of 500 MHz. As with any loop, the key is to make it as big as possible (to enclose the greatest possible area), and to use the largest possible conductor size (to reduce ohmic losses). A nice balun costs good coin and is. 8 feet in length to comply with FCC part 15. Co-phasing involves placing two (or more!) identical antennas either side-by-side or one over top another ("stacking") at a certain distance apart (usually a 1/2 Wavelength or more) and feeding the antennas in-phase. It provides good performance combined with an omnidirectional radiation pattern and simplicity of construction. On the good side it has a relatively low takeoff angle compared to a low dipole. For any given combination of transmitter power and vertical antenna size, your range at 1600 kHz could be up to 10 times greater than your range at 530 kHz. The antenna performs as three in-phase top-fed vertical radiators approximately 1/4 wavelength in height and spaced approximately 1/2 wavelength. The collinear antenna is designed to be mounted vertically. The radiation pattern of a vertical dipole is a 360 degree pattern around the main radiator. Rappaport, J. When setting up a four-square array, here are the most important details to know to get the best results: 1. The big difference between phased antennas and co-phased antennas is one exists and the other does not. 4 dB gain over a dipole. I have a Zero Five 27-foot vertical antenna. Now Im at the mercy of Cushcraft to get me a new one sent. 2 o 2 phased array for 40m at OH2BH This 40m antenna was designed for OH2BH to replace a storm and receiving and agile in contest OH1TV. Low ohmic resistance due to the small physical size combined with system impedance transformation and capacitive input coupling provide radiation resistance corresponding to an efficiency of about 85 percent. Tuning the antenna is done by means of a tuning sleeve of unique and patented design which slides over the length of each resonator. Or, they may be used in dual (co-phased) configuration on any vehicle made from any type of material. Create an antenna with a custom response. ULA creates a uniform linear array (ULA) System object, H. Learning how to tune an antenna entails lengthening or shortening the antenna so that, for the radio's specific frequency, it is working as efficiently as possible. That series of reports was converted with some modifications into a series of seven articles in QEX magazine. Now the two received signals are in phase with each other and combine to enhance the result. Resources listed under 7 MHz Vertical Antenna plans category belongs to 40M main collection, and get reviewed and rated by amateur radio operators. Welcome to RadioWavZ Antenna Company • Home of the worlds first 160-6 Meter Hexbeam. 93 - Picnic Vertical Wire Antenna. The comprehensive directory provides access to full contact and ability information for sourcing professionals, engineers and researchers wishing to get information on Antennas: Phased Array. Development of the waveguide grating antenna with high directionality is significantly important for the optical phased array. We used an AEA antenna analyzer for the source and connected it to a makeshift 15-foot transmit vertical antenna. 40M Phased Vertical Array ~ 40M Half Wave Dipole. Depending on the application, practical phased antenna arrays sometimes use specially designed antenna elements whose radiation pattern cannot be represented by a closed-form equation. When tuning co-phased antennas (dual), it is best to adjust both antennas an equal amount to maintain equality in their individual resonant frequency. Shop in several lengths, colors and series. Chosen by 'Big Gun' DX'ers and DX'peditions. The Half Square antenna is a wire antenna with two vertical radiators fed in phase. Novel Approaches to the Design of Phased Array Antennas By Danial Ehyaie A dissertation submitted in partial fulfillment of the requirement for the degree of. The antenna is resonant and a good match for 50-ohm cable; it can be easily adjusted for the best match to eliminate the need for extra tuning devices, like shunt inductors. Antennas are resonant devices. RE: RF Problems and the HF Vertical Antenna; Hi! I am using a Bencher/Butternut HF6V 23 foot vertical antenna with the optional 160 meter resonator attached. Both antennas favor the E/W direction and were about 80ft. Element tapering or weighting, specified as a complex-valued scalar, 1-by-N row vector, or N-by-1 column vector. However, unless the antenna is mounted a substantial distance from the real ground ( IE , more than ½ wavelength) the ground still has an effect on the radiation characteristics of the antenna system. 7mm in size with a heavy-duty build. I made contacts easily and the exchange was copied 100% about 95% of the time. 2M and 70cm bands are pre-set at the factory and there are no adjustments. More info can be found on our blog. Careful attention should be given when tuning the antennas, since local conditions can greatly impact the tuning and resultant performance (or lack thereof) for a vertical. QST October 1998, pp. n Can be phased to provide 3 dBd or 6 dBd gain, in a variety of patterns tailored to suit specific requirements. Find a clear area, free of obstructions. Determine the direction you want the array positioned. CB antennas are usually pretty cheap and shoddy - not THIS antenna! Some aluminum verticals are a pain to put together - not THIS antenna! Not only does it perform wonderfully on 10, 11, 12 and 15 meters but it is QUIET!!! I didn't cut it to tune it, I left it just like I bought it and assembled it in less than 15 minutes upon arrival. high with 4 sloping ground plane radials at 22ft high, 45 degree slope. And even if you can match the antenna. The examples in Figure 2 are for both elements driven. Bandwidth at it's broadest! VSWR 2:1 or better at band edges on 10-40 meters. Quote:> After setting up a 1/4 wave vertical ground plane for 10 meters which > worked pretty well, I decided to extend it up to 5/8 wave to get a lower > angle. Vertical stacking will reduce the vertical beamwidth and also will introduce extra sidelobes in the vertical (elevation) radiation pattern. This effect is worst on the low bands (40 and below) and less noticeable on the higher bands. Patterns of 43 foot Vertical Antenna on the major HF Bands. 129 - 2m Vertical Wire Antennas. For example, the impedance of a /4 antenna is 36.