Is the mike cable shield grounded to the radio mike connector shell and thus the radio case? It should be to preclude RF effects. It sounds like you have an unbalanced or end fed antenna? If that is a case a dipole/ doublet will be a better choice in that location where you have some RF coupling back into the shack. End fed antennas are often a problem creating RF in the shack, as are coax fed doublet/ dipole. Make sure the feedline is not an odd multiple of a quarter wave, ie 8 feet at 10m is a quarter wave and sure to cause a problem, and any odd multiple like 24 feet, 40 feet, 56 feet, etc. -Stuart K5KVH
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