Posted by
k6rb on
Dec 20, 2010; 6:16pm
URL: http://elecraft.85.s1.nabble.com/Inverted-L-was-OT-Vertical-antenna-tp5852957p5853296.html
Another antenna for top band that's worth considering is a Double L (Don
Toman, K2KQ) www.yccc.org/Articles/double_l.htm . It is essentially a
vertical dipole with the ends bent parallel to the ground and in the same
vertical plane. So, if you have, say, a 70 foot or higher tower, you can
raise the bottom horizontal wire up 10 feet off the ground and the top one
at 70 feet. The pattern is primarily influenced by the 60 foot (center
fed) vertical section (omni directional with decent low-angle lobes). I
find it works well both long-haul and close in. Because it is a vertical
dipole, the ground return is via the lower vertical/horizontal
(non-non-inverted L). So, no need for radials, just the one 105 foot
horizonal wire at 10 feet. I have mine hanging off the tower with bungee
cords at 72 and 10 feet. The vertical portion is parallel to the tower and
about 24 inches from it. Both horizontal portions go to the same tree (the
tree is not high enough, so the my antenna looks more like a pennant than
a true Double L). But, it does work. Compared with inverted Ls, half
slopers, and other antennas I've tried, this one has been the most
reliable.
Rob K6RB
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