Actually -- all of these things. Many radio stations have a server. Many of them sign up with an organization that does it for them. Sometimes the station just

Actually -- all of these things. Many radio stations have a server. Many of them sign up with an organization that does it for them. Sometimes the station just pays the fees out of general revenue, and sometimes the org inserts its own ads. You can start your own station with icecast2, GPLd and available from icecast.org Legal worries are your own.