That's surprising about KYA being listenable in Ukiah. Because when I lived in Marin in the 1970s, it was very weak in towns like Mill Valley and Larkspur-- but fine close to the Bay. My theory was that the Golden Gate Bridge (tons of metal) and the Marin Headlands (tons of rock) plus several mountains were all in a direct line between Mill Valley and the KYA tower-- which really hurt the signal in that specific direction.
Yeah, I think there were interference issues in Marin. Again, it wasn't a killer signal. And when I say listenable, I mean you could understand lyrics and jock talk through static. Which means nobody but a radio person would actually listen to it.