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I have a 65' foot antenna tower constructed like the one below only made from solid steel and not tube. I am not going to get any higher on the tower that about 40'. How far does the antenna need to be away from the mast so it doesn't interfere with the receive capabilities of the antenna? Will there be a weak or dead spot when the tower is between my receiving antenna and the antenna of the transmitting station I'm trying to receive?

Thanks