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Re: [TowerTalk] elevated radials vertical

To: "jeremy-ca" <>, <>
Subject: Re: [TowerTalk] elevated radials vertical
From: "Tom Rauch" <>
Reply-to: Tom Rauch <>
Date: Fri, 8 Jun 2007 19:11:20 -0400
List-post: <>
> Tom, have you used Elnec to model the folded unipole?

No. Not really.

> How about Professor John Mullaney's design program that is 
> specific to that antenna; have you used it? Ive been 
> trying to find a copy to no avail.

No. I really don't have much interest in the folded unipole 
since all my towers are insulated. When I did use shunt fed 
towers or folded unipoles modeling programs didn't even 

> Im especially interested in the 3 skirt wire version, 
> spacing from the tower and the 105-115 degree electrical 
> heights which Mullaney and others claim have a 
> particularly wide VSWR bandwidth..

Some shunt fed towers will do that because the skirt makes 
the antenna look very fat and the stub effect can compensate 
reactance changes to a small extent.

A vertical with a good large ground system is already 
significantly broader than of a dipole when both have 
similar diameters because the L/D is twice as favorable for 
the vertical. Even a regular 12 inch face tower, when series 
fed, has very wide bandwidth so I just don't worry about it. 
Since I don't worry about bandwidth and the efficiency is 
the same, I just never worry Carl.

73 Tom 


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