Before it was KYMS in 1964 it was KFIL. According to one Orange County resident in the late 1950's, the tower went up in 1958, early 1959. This person, as a young teenager then, watched the tower crew construct that tower right next to the Santa Ana Freeway.
Mark Denis, of 640 KFI & 1190 KEZY fame, worked at the then New KFIL. The station was "dark"
in 1963, but came back to life, as Jonny Bruce says, in 1964 as KYMS from the Saddleback Inn in
Santa Ana. That's not too far from that transmitter site. KYMS stood for "Your Music Station".