I was doing a search for Black Letter Days and one of the links to come back was from this college radio station at the University of California in San Diego. http://ksdt.ucsd.edu/playlist.php?find=Frank%20Black
I can't imagine hearing him once on the radio, but this station has played him 28 times since June and not the same songs either. They are some lucky listeners in So Cal these days.
they play Frank sometimes on KXLU, here in Los Angeles. it's the college station at Loyola Marymount University.. and the only good station to listen to in LA. they're streaming online now www.kxlu.com word.
Unfortunately, you have to be standing within approximately 100 ft of the station to pick up signal (at least that was partially true in 1991). But, the station was broadcasted over "the Hump".