I also lived in SoCal, like
@prcguy , and went to high school in the late '60s and college in the early '70s. Listened to pretty much the same stations, too. There were a lot of AM stations, and only a few were Spanish language. AM stations had a wide range of programming, while FM was mostly either rock or classical music.
Radio commercials then weren't as slick as they are today. Lots of jingles. There were alcohol (beer and wine) and tobacco ads since they weren't yet banned, but no prescription drug ads. There were plenty of automobile ads from local dealers ("Go see Cal" and others), plus the nationals. GM, Ford and Chrysler had more brands than today. New models were usually released in the fall, along with lots of advertising spots touting all the new features, including air conditioning.
Cellular technology was still in the wet dream stage and the only apple ads were from food stores.
Television broadcasters were just starting to provide some shows in "living color". There was no satellite tv and cable tv was in its infancy. We had VHF channels 2, 4, 5, 7, 9, 11 and 13. UHF tuners were on the newer sets, but we had only UHF channel 28 (KCET). Pretty much everyone had outside tv antennas. TV manufacturers like RCA, Philco, Sylvania, Westinghouse were telling everyone about their "huge" 21-inch color console tv's.
There were battery ads for familiar brands like Everready and Duracell, plus others like Ray-O-Vac. Two automotive battery brands that were advertised and are no longer with us are Die Hard and Nickel-Silver. A place called "Lou's Garage" advertised basic automotive repairs and Earl Schieb told us he'd paint "any car for $19.95" and Earl "Mad Man" Muntz sold car 4-track and later 8-track stereos. Gasoline brands like Mobil, Chevron/Standard, Phillips 66, Union 76 and Texaco (where Bob Hope told us "you can trust your car to the man who wears the star") advertised their leaded "ethyl" gasolines.
Col. Sanders was still alive and pushing his finger lickin' good chicken. Swanson advertised frozen "TV Dinners"
Amazon was only a river in South America, but Sears was the big name in retail. Los Angeles had lots of department stores including May Co., Broadway, Bullocks plus suburban upstarts like Zody's and White Front.