I think the problem is (with excuses to those on the board) LA is NOT a radio town. TV of course, movies hell yeah, but not radio. Even if a pirate came along (as they apparently do in Silverlake every so often), no one would pay it any mind and it would just linger and die. By the time it got a mention in the LA Times it would already be gone. And think of all the other ways to get out your message if you have a message to get out, or some deeply held conviction or passion (hint: rhymes with internet).
When I came out here from Boston 25 years ago I was a) appalled at the low state of radio (which has only gotten worse), and b) equally appalled that there weren't 4 or 5 hoppin college radio stations keeping everyone on their toes. Radio in LA isn't considered a glamour profession and just can't compete with the lure of TV, and the music industry is moribund. IMHO, of course.