I don't host any sort of "radios" myself, but I do know that people will play music for fluffs to listen to while playing FH, and some will even play FH (or another game) while hosting their LS. It's all up to you, but I'm not too good with technical stuff on that program
While you're currently streaming (or "online", as some may call it), then you can always let others know and encourage them to join in, whether that's by posting on your radio thread that you're online, or advertising in local or via movie clip