WA3WSJ:
>Recently I compared a 40m dipole fed with 300 ohm ladder line
up 20 feet to a ground-mounted vertical on a 100 foot cliff at Turkey
Point Lighthouse, MD. The vertical beat the dipole by around two
S-Units.
Interesting. I had just the opposite
experience in the recent Flight of the Bumblebees
test. I was using an 88' doublet with 40' apex and 25'
ends fed with 300 ohm line to an Emtech ZM-2 versus
a Par End-Fed 20/40 Half Wave Vertical. The doublet
was almost always better than the vertical although
there were a few times when the vertical was clearly
better. This was on a mountain top about 300' above
average surrounding terrain. I did a lot of comparing
signals on both 20m and 40m during the test.
Over flat terrain, a dipole up ~1/2 wavelength
has 7-8 dB gain over a vertical at typical 30
degree takeoff angles. On a mountain top, the TOA
goes down because the effective height is raised.
73, Bill W4ZV
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