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Buy yourself a good line isolator/choke/balun.  In the past, I have had that to happen.  All the power was not going out the antenna, and the coax was radiating too. 


Bought a Palomar Engineers Maxi-Choker 3K that fixed the problem.  It was installed about 8.5 feet down below an Imax antenna.  Receive noise level went down too.  I did not buy the one with the ground lug.  I did have to re-tune the antenna after the choke was installed.