In my experience in that area... on a good car radio you can get almost any of the L.A. sticks in Lancaster... as well as some Riverside and San Diego stuff too.
with the exceptions of a few... KROQ doesn't make it out there at all, as well as some of the stations that have a local adjacent squashing them.
But wow... for a market that's within earshot of Los Angeles... what horrible sounding local radio they have.