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> Does it show gain or loss ....
The pattern is largely influenced by the height above ground. I used a model
of a 20 meter beam, and changed the frequency to 18 MHz and the pattern is
essentially the same as a dipole gives. At 70 feet height it has three lobes,
at 10, 35 and 60 degrees above the horizon, with a huge amount of power
radiated straight up and looking down on the antenna from above it looks just
like a dipole.
In my opinion you are going to get no advantage at all over a simple dipole.
In fact be careful driving a trapped yagi on other bands, especially if you are
running power - the traps may not take it.
Rick K2XT
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