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Re: [TowerTalk] Question on Multiple Inverted L Antennas

To: "Tower Talk List" <>
Subject: Re: [TowerTalk] Question on Multiple Inverted L Antennas
From: "Jim Brown" <>
Date: Fri, 14 Jul 2006 11:07:36 -0700
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On Fri, 14 Jul 2006 12:23:25 -0400, Thomas Giella KN4LF wrote:

>BTW I have a website on the inverted L at 
> but it's a 7/16 w/l linear 
>loaded inverted L.

Your method is certainly one way to do it, but there are far 
simpler ways. The link below describes the one I think when you 
say "inverted L." His discussion is quite solid from an 
engineering point of view.

I agree with all of his comments re: ground system and maximizing 
the vertical portion. His selection of overall length to make it 
load well on several bands is also intersting. 

In essence, the overall length makes the antenna easier or more 
difficult to load, and the vertical section produces the most 
useful radiation. Also, the distribution of current on the 
vertical section, as well as the interaction of the vertical 
section with the earth around your station, are mostly what 
establishes the vertical pattern (that is, high/low angle). What I 
think you are doing by varying the length of those horizontal 
sections near the ground is putting the current maximum on the 
vertical section so that it produces the nicest low angle pattern. 


Jim Brown K9YC


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