FM radio service via cable actually was a minor controversy in the Bay Area 21 years ago.I also have had Mediacom and never had radio stations as part of the lineup.
Comcast ended FM service on some of its systems:
Comcast cuts back on FM service / Listeners in 31 North and East Bay communities object to cable company's decision
Comcast cuts back on FM service / Listeners in 31 North and East Bay communities object to...
After that blowed up good, Comcast put the FM service on a digital tier:
Comcast to restore 30 FM radio stations / Some would pay $5 fee for receiver for digital system
After months of complaints from Comcast customers angry at losing free FM radio service,...
I don't know if they're still offering it. I never needed it in Oakland where my house was actually at a higher elevation than the Sutro Tower.
Edit: Ignore the "Client Challenge" bit; the links will take you to the right articles.