[TowerTalk] Inv L Directivity

[john at kk9a.com]

There is enhanced radiation in the direction of the top loading wire, 
however it is not worth worrying about.  It is about 1db with a 1/4 wl 
inverted "L" that is 1/8 wl. high.

John KK9A




To: towertalk at contesting.com
Subject: [TowerTalk] Inv L Directivity
From: Craig Clark <jcclark at wildblue.net>
Date: Fri, 31 Aug 2007 13:33:58 -0400
List-post: <mailto:towertalk at contesting.com>

>    8. Re: Topband: INV L Directionality
>

G3XAP wrote a number of articles in RadCom (RSGB magazine) about this
question.

December 1973 p 842 "160m dx from suburban sites"


November 1977 p 858 "The G3XAP directional antenna from the
lower                               frequencies"

Ashton's conclusion was there is enhanced radiation in the direction
of the top loading wire. His antenna used a 40-60' vertical element
and a 130' top loading wire. To get omni-directional performance, he
added more top loading wires.





73, Craig Clark, K1QX