[Antennas] Metal roof interaction

[Danny Richardson]

At 10:26 PM 5/7/2006, you wrote:
>[snip]
>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.
[snip]

Jon,

About the only solution I can recommend is to computer model your proposed 
setup. You could make a wire grid model of you roof, tower, and beam and 
get a good approximation (depending upon the model accuracy) of expected 
performance.

73,
Danny, K6MHE

http://k6mhe.com
   


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