The other night while the fan was running in the bedroom window, I could have sworn that I could hear a radio station playing in the distance. I could hear the mumbling of a radio dj, and then I recognized the tune "It's been a hard days night".
I asked my wife if she could hear it, and she could not, so she reached over and turned off the fan, and then I could no longer hear it, so she turned it back on, at which point I could again hear the sound of a radio playing the same tune. I tried to ignore it, but the sound was still audible to me, and after a bit the tune changed, so I know it was not a matter of me having a tune stuck in my head.
Any ideas as to why I could only hear the "radio station" while the fan was running?