John Peel R.I.P Him and Alan Freeman were the only source of real music in the UK in the 70's when you lived in nowhere...
In LA, it was "Captain Midnight" at KPFK with the weirdest mixes ever, that really helped give folks like Frank Zappa and others a nice hand. And later helped raise the awareness of the "imports" and foreign bands, that became famous.
One other group that was a MAJOR and MASSIVE part of the KPFK history, is, no doubt about it ... the Firesign Theater!
Later KNAC, became a major player in the imports and foreign music, that led directly to Jem Records (I think ... not sure about this), which for a couple of years, was already a very large importer of albums. I can not say how good KNAC was, as we could not reach it in Santa Barbara! By the 70's KMET and KLOS were already tied up to the "dot" system with the Who, Beatles, Stones, Led Zepellin and such as mandatory plays every hour to make sure the audience was there!
On the wird side of things, Dr. Demento started his career in the LA area and he did have a nice collection of really off the wall things! And of all these, the fun one to listen to that had nothing new? ... Wolfman Jack! ... with signals being routed via Tijuana to flood the LA/San Diego market!