I get the same interference if I run my bath fan with the radio in AM. I think its a freq generated by the fan motor. In your case it may be both are on the same circuit if so try using a different power circuit for the radio or shielding the power and antenna feed. For me it just easier to shut the fan off.
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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