This question is kind of the bane of our existence. When we first started over 30 years ago we actually DID start on the radio. Unfortunately, times have changed and getting on the radio is very difficult and getting people to listen can be even MORE difficult.
In the past, the good folks at Peach State Public Radio used to invite us in to play every Hallowe’en for several years. And we spent the first two summers of our existence with a weekly program on commercial radio (nobody told us it was impossible). We also have podcasts!