In fiddling with a 72MHz RX in a particular plane (Pike), there were only two solutions that gave an adequate ground range-check:
1. Stock length antenna dangling straight out of the cabin, 90 degrees to the fuse. Quite impractical. Any other solution involving the standard antenna length gave frighteningly short range.
2. Exactly doubling the antenna length, exiting the fuse halfway down the boom, taped to the bottom of the boom all the way back, leaving the excess dangling. Invisible from more than six feet away and glitch-free ranging to vision limits.
I had read earlier that as long as one kept the antenna in multiples of its own length, it should work.
Tom
[EMAIL PROTECTED] wrote:
Excellent post! Lots of good information, Doug.
Here's a minor nit-pick:
(Now, if you add another 1/4 wavelength, or a multiple of that, you'll probably slightly improve range. But only slightly.)
I'll bet you were really talking about adding another 1/2 wavelength or multiple of that. Adding another 1/4 wavelength would create a 1/2 wave end-fed antenna, which would have a much higher input impedance. On the other hand, converting a 1/4 wave antenna into a 3/4 wave antenna would make sense.
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