Explain this phenomenon, please
 

Doug Smith W9WI wrote:

Someone in that neighborhood has a satellite radio that uses 88.3 to
transmit the audio into a regular radio. *IOW you're listening to a
(very low powered!) pirate station.

Actually we don't know that it's a pirate although the owner of said
transmitter is likely not in compliance with part 15 which requires
non-interference. pirate, no, non-compliant, most likely if someone
regularly listens to another station on that frequency.