{"id":42,"date":"2014-11-07T14:55:00","date_gmt":"2014-11-07T14:55:00","guid":{"rendered":"http:\/\/3dprinterpartsandaccessories.com\/dad\/?page_id=42"},"modified":"2026-01-04T16:54:12","modified_gmt":"2026-01-04T16:54:12","slug":"antennas","status":"publish","type":"page","link":"http:\/\/www.n3ttt.com\/dad\/antennas\/","title":{"rendered":"Antennas"},"content":{"rendered":"\n
<\/iframe><\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\"><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-skyline.jpg\"><img decoding=\"async\" width=\"900\" height=\"247\" src=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-skyline.jpg\" alt=\"Skyline view at AA1K: 3-el 40m yagi (left); 6\/10 meter yagis on 160m driven-element tower (center) and 2nd director of 160m array (right).\" class=\"wp-image-159\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-skyline.jpg 900w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-skyline-300x82.jpg 300w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-skyline-750x206.jpg 750w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a><figcaption class=\"wp-element-caption\">Skyline view at AA1K: 3-el 40m yagi (left); 6\/10 meter yagis on 160m driven-element tower (center) and 2nd director of 160m array. CLICK ON ANY PHOTO TO ENLARGE<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">160 meters, transmit<\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright\"><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/BaseCloseup3.jpg\"><img decoding=\"async\" width=\"300\" height=\"224\" src=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/BaseCloseup3-300x224.jpg\" alt=\"Insulated base on Tower 1 -- 160-meter driven element.\" class=\"wp-image-23\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/BaseCloseup3-300x224.jpg 300w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/BaseCloseup3-1024x768.jpg 1024w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/BaseCloseup3-624x468.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption class=\"wp-element-caption\">Insulated base on Tower 1 \u2014 160-meter driven element.<\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">K3LR-inspired parasitic vertical array. Rohn 25 driven element, sits on insulators and series-fed through L network matching. Sloping T-shaped wire parasitic elements supported by rope catenaries, each spaced 66 feet from tower, are used as 3-element vertical yagi to give about 5 db gain and 25 db f\/b in four selectable directions: NE, NW, SE, SW. Relays at base of each element ground parasitic wire for director, add coil to ground for reflector (resonates element just below 1800 kHz), or floats for omni pattern. 120 slightly buried quarter-wave radials under each element. Three elements active at one time; other two are left floating (above ground) and thus electrically invisible to the active elements. Additional wide-spaced second director element toward NE (Europe) adds about 1 db gain in that direction.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft\"><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-satellite-view-160m-BS_EF.jpg\"><img decoding=\"async\" width=\"274\" height=\"300\" src=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-satellite-view-160m-BS_EF-274x300.jpg\" alt=\"Red dots show approximate positions of 160 meter BS\/EF array elements (Google satellite view)\" class=\"wp-image-138\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-satellite-view-160m-BS_EF-274x300.jpg 274w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-satellite-view-160m-BS_EF.jpg 640w\" sizes=\"auto, (max-width: 274px) 100vw, 274px\" \/><\/a><figcaption class=\"wp-element-caption\">Red dots show approximate positions of 160 meter BS\/EF transmit array elements. Numbers show four main towers. Tower 1 is the driven element of 160-meter K3LR parasitic array for transmit. (Google satellite view)<\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">WW2Y-inspired broadside\/endfire array. 325 feet broadside, 148 feet endfire spacing. Broadside pattern oriented northeast\/southwest, soon to be switchable with about 8 db gain over a single element. One element is shared with the parasitic array (relay-switched between the two arrays) and other three are other T-shaped wires hung from loblolly pine trees and towers. About 73 feet vertical with 58 feet in the top-hat \u2013 resonant around 1930 kHz. Small coil at base to resonate around 1830 kHz. Initally the two rearward elements (bottom two red dots in photo at left) were simply tuned as parasitic reflectors until I get to the phasing to make switchable NE\/SW.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00a0<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">80 meters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The \u201cforgotten band\u201d at AA1K.\u00a0 For many years I\u2019ve used a single inverted vee with apex at 95 feet, hung on the 15 meter tower. Around 2017 I erected four quarter-wave wire vertical elements, hung from trees in a broadside\/endfire array centered within the 160 meter broadside\/endfire array. The 80 meter elements simply tie in to a single radial wire that passes nearby from the 160 array. Spacing on the 80 meter elements is such that this may be expanded to a full 8-circle array someday. For now it favors Europe and the rearward two elements are loaded to use as parasitic reflectors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00a0<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright\"><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/40-meter-stack-switching.jpg\" rel=\"noopener noreferrer\"><img decoding=\"async\" width=\"150\" height=\"150\" src=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/40-meter-stack-switching-150x150.jpg\" alt=\"\" class=\"wp-image-258\" loading=\"lazy\"><\/a><figcaption class=\"wp-element-caption\">Homebrew stack matching box at base of Rohn 55 tower<\/figcaption><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">40 meters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The latest addition to our yagi collection, in September 2025, is a JK Antennas 404 Grande. This is four full-size elements on a 44\u2032 boom. This formerly resided at K4WMS (SK) in Virginia, and had been assembled here for about a year until son Adam N3TTT and I found time to tram it to the top of the Rohn 55 tower. The rotor is an M2 OR2800. Previously, we had an Eantennas 40MDY3 at the top, and before that a stack of HyGain 7-3 Discoverer yagis. One of those remains (at 60 feet) to be used in combination with the Grande.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-large\"><img decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-3-768x1024.jpg\" alt=\"\" class=\"wp-image-613\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-3-768x1024.jpg 768w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-3-225x300.jpg 225w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-3-750x1000.jpg 750w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-3.jpg 810w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><figcaption class=\"wp-element-caption\">AA1K attaches JK 404 Grande to mast on Rohn 55 tower.<\/figcaption><\/figure>\n<\/div>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-2-1024x768.jpg\" alt=\"\" class=\"wp-image-614\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-2-1024x768.jpg 1024w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-2-300x225.jpg 300w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-2-768x576.jpg 768w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-2-750x563.jpg 750w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-2.jpg 1080w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">JK 404 Grande is trammed to top of Rohn 55 tower.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-1-1024x768.jpg\" alt=\"\" class=\"wp-image-615\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-1-1024x768.jpg 1024w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-1-300x225.jpg 300w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-1-768x576.jpg 768w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-1-750x563.jpg 750w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2026\/01\/JK-404-Grande-install-1.jpg 1080w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">N3TTT manages the haul line on capstan winch while tramming JK 404 Grande to top of Rohn 55 tower.<\/figcaption><\/figure>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">On three other towers that are on a line broadside to Europe, we tried an array of three 2-element loaded yagis (Cushcraft XM240\u2019s on the outside at 83 feet and Force 12 Delta 240 at 75 feet in the middle), all fixed on Europe in a broadside \u201cstack.\u201d While modeling predicted superior performance the results were disappointing.\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">20 meters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Three stacked Hy-Gain 204BA yagis (4 elements on 26-foot boom) on Rohn 45 tower. Top rotates with T2X Tailtwister rotor; bottom two are fixed on Europe. This has performed quite well and the third beam makes for excellent front-to-back performance. In 2019 I installed a stack of two M-Squared 5-element 20 meter beams (44-foot boom) at 79 and 41 feet on the Rohn 55 that now holds the JK 404 Grande. This stack, fixed on Europe, was usually even-up or only slightly better when compared with the 204BA stack. When we put up the JK 404 Grande, the M-squared stack was fixed at 162 degrees and does quite well for South America and the Caribbean.\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">15 meters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Two stacked Wilson 415M yagis (4 elements on 17-foot boom) on Rohn 25 tower (tower 3) were used since about 2000. These were replaced in 2020\/2021 on a new Tower 8, 90 feet of Rohn 55. I purchased three Force 12 Magnum 715 (7 elements on 44-foot boom) yagis from the N3HBX contest station being dismantled in Maryland. The top antenna at 91 feet rotates with an Orion rotator. The bottom two, at 32 and 62 feet, are fixed on Europe. An Array Solutions WX0B StackMatch is used for selecting any combination of the three yagis, using Green Heron Everywhere controller. There is a definite improvement over the original Wilson stack.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2023\/10\/10-meter-stack.jpg\" rel=\"noopener noreferrer\"><img decoding=\"async\" width=\"810\" height=\"1080\" src=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2023\/10\/10-meter-stack.jpg\" alt=\"\" class=\"wp-image-540\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2023\/10\/10-meter-stack.jpg 810w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2023\/10\/10-meter-stack-225x300.jpg 225w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2023\/10\/10-meter-stack-768x1024.jpg 768w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2023\/10\/10-meter-stack-750x1000.jpg 750w\" sizes=\"auto, (max-width: 810px) 100vw, 810px\" \/><\/a><figcaption class=\"wp-element-caption\">This 100-foot Rohn 45 tower supports a 5\/5\/5\/5 stack of modified HyGain 105BA yagis at 22\/44\/66\/100 feet. A 2-element Cushcraft XM240 40-meter beam at 83 feet is used in a 6-element broadside array toward Europe. Tower at left is 90 feet of Rohn 55, holding a 3-stack of Force 12 Magnum 715 yagis (7 elements for 15m on 44\u2032 boom. At top is 2-eloement 30m yagi.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">10 meters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">My latest antenna upgrade began in November 2022, installing 100 feet of Rohn 45 to replace the 100 foot Rohn 25 that held the old 15-meter Wilson stack (tower 3). This new tower was completed in October 2023 with a four-stack of modified HyGain 105BA 5-element yagis at 22, 44, 66 and 100 feet. A Green Heron Engineering Four Stack Hamplus controller is used for selecting any combination of the four antennas. This array replaces a single modified Hy-Gain 105BA at 48 feet that had been used for several years. The antennas are 5 elements on 26-foot booms, using the N6BV optimized OWA dimensions from the ARRL Antenna Book.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">10-12-15-17-30 meters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">I obtained an M-Squared 17-10 log periodic yagi (26 foot boom) in a package deal with some other antennas and decided to try it on the 10-meter tower temporarily, at 42 feet high (the 10-meter was taken down for refurbishing after some tree damage). It is my first dedicated WARC band yagi, and I also installed a 30-meter wire dipole at the top of this tower. The LP works well on the WARC bands, and it is not as good as my monobanders on 15 meters, as expected. It did well on 10 meters in the CQ WW DX SSB and CW contests in 2019. The 17-10 LP is now atop Tower 1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6 meters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A few years ago I built a single 5-element yagi, 24-foot boom and put up at 100 feet on the 160m driven element tower. That replaced a 4-element 6m yagi on 12 foot boom that had helped me achieve DXCC on 6m. It also serves as top loading for the 160-meter driven element (Tower 1). In 2020, I rebuilt an old Cushcraft A50S with the <a href=\"http:\/\/www.bigskyspaces.com\/w7gj\/A50-5S_w5wvo.pdf\">W5WVO mods<\/a>, extending the boom to 17.5 feet and changing the element lengths and spacing. This went on the mast of Tower 7 at about 43 feet high, a few feet below the 10m yagi, and has performed well.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2 meters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A 3 element 2m vertical yagi fixed south high on the 160m driven element is used by the AA1K-10 node on 145.05.\u00a0\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"http:\/\/aa1k.us\/rxarrays\/\" target=\"_blank\" rel=\"noopener noreferrer\">Receive arrays page<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/Tower-supporting-BSEF-TX-element.jpg\" rel=\"noopener noreferrer\"><img decoding=\"async\" width=\"900\" height=\"675\" src=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/Tower-supporting-BSEF-TX-element.jpg\" alt=\"\" class=\"wp-image-253\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/Tower-supporting-BSEF-TX-element.jpg 900w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/Tower-supporting-BSEF-TX-element-300x225.jpg 300w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/Tower-supporting-BSEF-TX-element-768x576.jpg 768w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/Tower-supporting-BSEF-TX-element-750x563.jpg 750w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a><figcaption class=\"wp-element-caption\">Rohn 25 tower with mast extension supports T-shaped wire element used in the 160-meter broadside-endfire transmit array. Three other elements are supported by towers and trees.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/BSEF-TX-element-tower-base.jpg\" rel=\"noopener noreferrer\"><img decoding=\"async\" width=\"900\" height=\"675\" src=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/BSEF-TX-element-tower-base.jpg\" alt=\"\" class=\"wp-image-255\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/BSEF-TX-element-tower-base.jpg 900w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/BSEF-TX-element-tower-base-300x225.jpg 300w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/BSEF-TX-element-tower-base-768x576.jpg 768w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/BSEF-TX-element-tower-base-750x563.jpg 750w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a><figcaption class=\"wp-element-caption\">This Rohn 25 tower that is used to support one of the broadside-endfire transmit array wire elements sits on large insulators as it once served as an 80-meter vertical. At right is a 4.1 uH coil used to lower the resonance of the element to about 1830 kHz.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone\"><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-main-image.jpg\"><img decoding=\"async\" width=\"1920\" height=\"838\" src=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-main-image.jpg\" alt=\"AA1K works on the new upper 10-meter beam while standing atop the Rohn 45. \" class=\"wp-image-110\" loading=\"lazy\" srcset=\"http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-main-image.jpg 1920w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-main-image-300x131.jpg 300w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-main-image-1024x447.jpg 1024w, http:\/\/www.n3ttt.com\/dad\/wp-content\/uploads\/2014\/11\/AA1K-main-image-750x327.jpg 750w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><\/a><figcaption class=\"wp-element-caption\">AA1K works on the new upper 10-meter beam while standing atop the Rohn 45.<\/figcaption><\/figure>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2021\/12\/C4S.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"Embed of C4S.\"><\/object><a id=\"wp-block-file--media-58148c74-f697-4750-82bc-41731dacefe2\" href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2021\/12\/C4S.pdf\">C4S<\/a><a href=\"http:\/\/3dprinterpartsandaccessories.com\/dad\/wp-content\/uploads\/2021\/12\/C4S.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-58148c74-f697-4750-82bc-41731dacefe2\">Download<\/a><\/div>\n<\/body>","protected":false},"excerpt":{"rendered":"<p>160 meters, transmit K3LR-inspired parasitic vertical array. Rohn 25 driven element, sits on insulators and series-fed through L network matching. Sloping T-shaped wire parasitic elements supported by rope catenaries, each spaced 66 feet from tower, are used as 3-element vertical yagi to give about 5 db gain and 25 db f\/b in four selectable directions: [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-42","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"http:\/\/www.n3ttt.com\/dad\/wp-json\/wp\/v2\/pages\/42","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.n3ttt.com\/dad\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/www.n3ttt.com\/dad\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/www.n3ttt.com\/dad\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.n3ttt.com\/dad\/wp-json\/wp\/v2\/comments?post=42"}],"version-history":[{"count":4,"href":"http:\/\/www.n3ttt.com\/dad\/wp-json\/wp\/v2\/pages\/42\/revisions"}],"predecessor-version":[{"id":616,"href":"http:\/\/www.n3ttt.com\/dad\/wp-json\/wp\/v2\/pages\/42\/revisions\/616"}],"wp:attachment":[{"href":"http:\/\/www.n3ttt.com\/dad\/wp-json\/wp\/v2\/media?parent=42"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}