I don't know when this picture was taken but during the 60's and 70's when I was growing up, they are one of two local "top-40" stations, KJR being the other. KOL was located on Harbor Island, and their tower had large NEON KOL sign on the tower, while I was studying for my 1st class radio telephone operators license, I visited Bill Wolfenbarger there often. It was my opinion that KOL was what AM radio was about back in the day. Unfortunately as time went on the music stations drifted towards FM, and AM stations generally changed format. KOL was one of the last to abandon the "top-40" format, but when they did they went to country rather than talk radio and that format did not work, largely because we had another well established AM country station, KAYO, but KAYO died as a country format and went to a political talk radio format when an FM station went country. Anyway I love the way the old transmitter was constructed with all the glass so you could see everything. Back in those days, most AM stations were high level plate modulation, not electrically efficient but provided the best audio until Harris Gates came out with their pulse width modulation which produced the best of both worlds. CCA also had a modulation scheme which used a peak and carrier tube with the peak tube being phase modulated, such that it could either add to the carrier tube or subtract from it, depending upon the phase relation it introduced, but that phase component really created a lot of distortion resulting in not very clean audio.