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I have the W2IHY 8 band EQ and EQPlus, which has downward expansion and noise gate.  I don't usually run the noise gate in conjunction with the downward expansion.  I can get rid of most of the background noise by getting that along with the gain at the various stages set properly.  The biggest problem is that the Ameritron AL800H has a very loud blower and the Heil GM5 isn't directional enough.  A mic like an RE-20 or the newer Heil PR-781 is much more directional.  Not to mention that the Icom 746 Pro isn't going to cut it on AM...