Mike (and others)...
There's been some discussions on the HFPack list about a ground independent
vertical design, published in the April 2004 issue of QST. The author,
Brian Cake, KF2YN, describes a "C-Pole" loop antenna resembling an OCF
(off-center fed) horizontal antenna, only wrapped in a loop. A tree branch
about 18' off the ground is all that's needed to hoist the 20M version into
the air. Feed is at ground level through a choke balun. EZNEC shows a low
angle of radiation, and no radials/counterpoise, etc. are needed.
Details for the 20M version may also be found:
http://www.angelfire.com/tx4/netxqrpclub/
And the original article describing the background and 20 - 10M designs:
http://www.arrl.org/members-only/tis/info/pdf/0404037.pdf
73,
Steve
aa8af
-----Original Message-----
HF verticals perform poorly without, as you mention above, a very good
counterpoise or ground plane. In temporary portable installations, that is
generally very difficult to obtain. But for a dipole, it's a non-issue
altogether.
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