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Since this thread started off with a 500w amp as the issue, I think that improving the wiring and adding a stiffening cap would help a lot.


But he didn't say what kind of antenna he was using either.  If he did; I missed that part.  Sure wouldn't want to run a 500w amp into anything smaller than a 1/4 wave steel whip or a Predator Freedom DX-K Fighting Stick.  The antenna is always at the other end of the efficiency chain . . .