08-20-2010, 02:16 PM
Crotchety Old Bastard
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Join Date: Apr 2005
A 'J'-pole should work about like any other 1/2 wave antenna (that's what it is, a 1/2 wave). There are practical aspects that determine what sort of metal should be used for an antenna. Strength is one of the things that determines that. Doesn't make a huge difference if it's copper, aluminum, steel, cast iron, or gold.
got a 50 foot pole? Put that impedance matching 'stub' the right distance down from the top of that pole and feed it as with any 'J'-pole, and you got an antenna almost 25 feet high. Ought'a work just fine. With a little adjusting of the various lengths/distances, you can do the same thing with a tower, or flag pole, or water tower, or grain silo.
'J'-poles on HF
are sort of large and impractical, but, they would work as well on HF
as they do on VHF/UHF