It would be useful if all radio topics could be hosted and discussed on a dedicated fedi instance. The lemmy.radio description is constrained to amateur radio:

“A lemmy instance for amateur radio enthusiasts and communities.”

There are no communities anywhere in the fedi for FM or AM radio apart from !radio on LW (a Cloudflare-centralised instance). And that community is strangely constrained (tech support/user inquiries unwelcome according to the sidebar). DAB radio has one community strangely placed on a “UK centric” instance: !dabradio.