"DOUBLE WHAMMY" ANTENNA
Antenna de jour is a 40 meter 2 element, reversable,wire beam at 40 ft. high .
The Christman method of 84 degree feedlines with a 71 degree phase was employed in a horizontal two dipole wire design spaced at 1/4wl.
I have added an 17 meter version of the same design and getting fantastic reports around the world and stateside with 24db front to back.
Quite often this $50 wire antenna at 40 ft., using reversable phased double dipoles in two trees can compete as well as a mono band at 80 ft.,
I see that everyday, like recently, when a NJ station with stacked stepper monobanders at 85 feet got my same report, 5-9 into Saudia Arabia on 40 at 5pm in NY. $50 vs $10,000, made my day !
The ability to double my ERP on transmit and receive is priceless. Always get at least 25 dB front to back, The concept is extremely valid ,the thought came from exploring everything that I have learned from phased verticals and then applying that knowledge to horizontal dipoles, which was a leap in faith, and so far it's the best 40/17 and 80 meter beam I have used.You won't see this design in any antenna book as far as I know, hi.
The concept is valid for ANY monoband frequency!
Give it a try in your backyard, probaly work as well in an inverted vee configuration.
Just noticed the 40 version works extremely well on 10 meters and has noticable front to back. Fed straight in with 1.8 to one !
25DB front to Back
120 degree Beamwidth
1.3 to one with 75 degree patch feedline
40 ft. high
THE RELAY PICTURED IN UPPER RIGHT ,expandable, IS THE SAME FOR THIS ANTENNA, WAS VERTICALS, NOW DIPOLES !
Enjoy talking to the UK and many others usually around 7.140 or 3.787evenings, fun group very welcoming for DX contacts and antenna talk .Also on the OMISS Nets most evenings at 7.185 around 0100 and www.eham.net articles under my call in articles section.Take care and look foward to hooking up with you on the air. This antenna working WAY better than many previous concepts pictured below.
40 meter moxon at 45 ft.
Couple of winters ago backyard, guess what they say about quads in the Winter is true.
4 square did a credible job, but raised radials were a hazard to low flying birds and trespassers!
Shrunked 40 meter phased reversable quad, worked great but never survive upstate NY winter.
80 meter top loaded phased verticals, raised radials, pretty much equaled a dipole at 60ft. something to consider if no room for dipole.
Better mention my primary antenna, impossible to photograph, is a 40 meter ladderline fed EDZ around 185 ft. long at 65 ft. Extremely versatile on all bands but very narrow beamwidth on 40, but nice to have 3dbd gain in two directions.
Classic 160 invL, not quite classic, using 2, 120 ft. raised radials at 6 ft. high.Goes back in the air every December. Noisy but effective, I use theEDZ for receive antenna, nice combo!
Please check out myarticles on www.eham.net
Will be looking for you on the DX summit.
1474859 Last modified: 2014-11-26 21:33:10, 9235 bytes
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