I agree with Dennis that a simple gamma or omega match on the boom
of the TH-11 would give you a decent antenna for 40m, high in the air.
I would suggest using 12ft of 1" 6063 tubing, stood off the boom by
6-10", electrically attached at one end of the boom, running the
full length to the mast clamp. Your tuning unit could be located in
a weatherproof box on the mast.
The pattern may be weird, but the cost would be minimal. Another
option would be to extend the boom in either direction to make a
longer dipole.
73 Bill N4LG
At 09:12 AM 3/9/2016, Dennis W0JX via TowerTalk wrote:
Placing the 40M dipole parallel with the boom is the best approach
if you can get it up 6 or 7 feet above the TH-11.
Otherwise you can try to load the boom on 40 meters. You attach
the shield to the center of the boom and then tap the center
conductor out on the boom by using a gamma rod. I don't have the
details but perhaps someone on this reflector knows where to find
the article about how to do this.
73, Dennis W0JX
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