RadioBanter - View Single Post

November 8th 03, 10:15 PM

On 8 Nov 2003 13:12:25 -0800, wrote:

I am converting a RS FM ant into a 2m yagi per the article. I have
worked out a way to flip flop the antenna from vertical to horizontal
and back as I like, but am concerned about interference from my 20
foot 'tower' when in horizontal mode, it being emt. Would some kind of
shielding on the emt work to prevent problems? Or would it even be
enough of a problem to worry about?
Thanks for any help!

I think you meant interference in the vertical position. About the
only way to prevent interaction is to use a non-conductive mast such
as fiberglass. Placing a non-conductor over the emt wouldn't help
much, if any, so it's probably not worth the effort. You may notice
change in SWR and you can expect a change in radiation pattern
-however it may not have a significant impact on performance for local
and/or repeater use.