There were three top 40 stations in the DC metro when I was at WINX. Each one of them had “something wrong” with their signal that prevented them from reaching the entire DC market 24/7. Our station was only 500-watts (three tower directional south) at night. It barely made it to the DC line. We partied a lot at clubs on Wisconsin Ave, but the signal was almost unlistenable even in NW at night. WPGC was a daytime station. They had a 15,000-watt FM station that reached the entire market all of the time, but FM penetration at that time was very low. They were a sensational station. I had an AM/FM radio in my car, unusual at the time, but I listened to them on FM practically all the time when driving. If you go to reelradio-dot-com, for $10 you can access their over 1500 airchecks. Do a search for WPGC in the search box and click on the one from 1969 with Tiger Bob Raleigh, about 2/3 of the way down the list. All the songs are intact, and it is a fantastic aircheck. It was made on the day man first landed on the moon. WEAM probably had the best reach, although at night they were pretty rough copy at about College Park and east of there on the beltway. They were the ratings-dominant station at the time, but IMHO, WPGC was a much better sounding station. It wasn’t until WRC came along, just after I had left, that an AM station covered all the market all the time.