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Re: Topband: Recent 160m Antenna Questions

To: "Dave Court" <>, <>
Subject: Re: Topband: Recent 160m Antenna Questions
From: "Guy Olinger, K2AV" <>
Date: Wed, 28 Nov 2007 20:33:18 -0500
List-post: <>
"So in case it's back to inverted Ls (either extended or regular) it
would also be nice to have views on the original question. What
theoretically and practically appears to give the best results, the
extended L or the quarter wavelength L."

The comparison is dwarfed by the ground issues.  If the ground/counterpoise is 
lossy the higher feed impedance of the extended L will force less current 
through the loss and make it more efficicient. If the ground system is 50 or 
60 radials, the extended L will have some mild pattern shift to high angle 
that may or may not be useful to an given operator.

OUT IN THE OPEN, an extended L long enough to make a simple series capacitor 
match to 50 ohms, and over 50 or 60 radials, is a high performing classic 
simple omni-directional antenna for both short and long haul.

However, since so many seem to use a tower as a support for an L, performance 
predictions get defeated by the unpredictable aspects of a tower, the actual 
electrical height of the tower in wavelength, miscellaneous conductors running 
off it for miscellaneous lengths on top of the ground or buried, top-loading 
by other antennas, tower grounding, radials, or lack of either or both, etc., 

73, Guy. 

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