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[TowerTalk] V beam leg lengths

Subject: [TowerTalk] V beam leg lengths
From: Chuck Gerarden <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Sat, 10 Apr 2010 21:27:59 -0600
List-post: <">>
I am designing a V beam system with 4 legs radiating out from my 80 
meter tower, parallel to the ground. any 2 of the 4 wires can be selected
by relays for correct apex angle based on frequency. I am trying to 
avoid any interaction with the 80 meter horizontal phased array at 100 
feet. V legs are at 70 feet. I am trying to avoid leg lengths that are 
near 1/2 waves on 80 and have come to a compromise of 500 feet. My 500 
feet was determined by multiplying 3 - 1/2 (140)waves and adding a 1/4 
(70)wave. Antenna is fed with 450 ohm line and balanced tuner.  I intend 
to use the V beam mostly on 40,20,15,and 10. The enclosed angle between 
the wires is about 30-35 degrees. Does anyone have suggestions on best 
wire length to avoid 80 meter interaction? Any empirical input to this 
project is appreciated. . I also refer everyone to the Aug 1956 QST 
article on multiple V beams.

Thanks, Chuck, W0DLE

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