Compression in radio? (was MP3 article)

[BARNARD]

BTW, following up on Joe Gracey's comments on the sound quality and nature
of these files, I have a related question for Joe or others who know,
regarding radio broadcast...

That is:  do radio broadcasts add compression to the recording being
broadcast?  In listening to various recordings on the radio, I've gotten
this impression, but in technical terms I don't really understand what's
going on.

Thanks,
--junior