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[TowerTalk] Metal roof interaction

To: <>
Subject: [TowerTalk] Metal roof interaction
From: "Jon M. Knodel" <>
Date: Sun, 7 May 2006 22:29:33 -0700
List-post: <>
Thanks to all those that have given me feedback in my tower project.  I am 
getting ready to install it this summer and am again, looking for some help 
before I do.  My house has a metal roof that I am afraid is going to interact 
with the antennas.  

I will be able to completely load the tower with all the antennas that I want 
to at the 40' height.  This would put the top of the tower only about 25' above 
the metal roof.  Is this close distance going to affect the antenna performance 
(3 element SteppIR yagi)?  I can also sacrifice some antenna load and put the 
tower up to 60'.  This would be the path I would take if the roof would 
interfere with the antenna at 40'  (trading off antennas for additional height 
and less interaction with the metal roof).

So, my question is:  how much would the roof interact with my antenna?  Because 
it is a SteppIR and fully adjustable, is this a concern at all due to the fact 
that it can be retuned easily?  Or would the radiation pattern be adversely 
affected?  I appreciate all the help I can get.  Thanks.

Jon, N7XW

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