wrote in message
om...
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?

I can think of ways to make the EMT not reflect, but they would also make it
absorptive, which would also be not good.

Fiberglass pole is pretty much the only way to be sure it dosen't interact.

You have me interested though, what mechanism are you using?
I've toyed with some ideas, but never hit anything I liked.
I thought about using a crossed yagi, but that gives me a 3db penalty in
both modes. :-P
Also, birds and ice love horizontal elements. I'd like to be able to go
horzontal, but stow it vertical to avoid those hazards.