JoeAZ ... I followed your suggestion and tried the Hairdryer on a separate circuit via an extension cord. The interference existed when the hairdryer was "on" in the bathroom under the antenna, but the interference stopped as I walked with the hairdryer into a different room that is not under the antenna.
Tower Guy... The antenna is on a tripod and mast on the roof (drawing attached). As you suggested, I put a ferrite core on the hairdryer power cord and the interference still exists when the hairdryer is on.
These are great questions and suggestions! This additional information still leads me to believe that the interference is directly transmitted from hairdryer to antenna.
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