Yes, buying time from a radio station that sells time is another route.   We have a number of stations in the NYC area that do that and as M.Ted points out, some can make a living from it.

You might also consider approaching a local non-commercial station with a program idea. This could help you "get your feet wet" and learn a bit more about the operation.

No problem about mis-remembering my call letters. WFMU is a good station and if the station is going to be confused, it might as well be confused with a good station! I like WFDU though! :)

Ron