My own experience with coin-operated TVs was as recent as 2001, while I was on bus trip from Los Angeles to Milwaukee during Christmas time. I had a layover at the Greyhound depot in downtown Denver (nice downtown area, BTW), and to pass the time over while waiting to re-board the bus, I watched some of TV. As far as I can remember, I sampled nearly each of the major stations in town--channels 2, 4, 6, 7, 9, 12, and 31. I remember the picture quality being just absolutely terrible, especially on 2 (KWGN). Channel 7 (KMGH) probably had the clearest picture of the group, followed by 12 (KBDI, the area's secondary PBS station).
Ironically enough, our next extended layover (more extended than scheduled) was hours later in downtown Omaha...early Sunday morning with practically no one on the street, and we were stuck at the Greyhound station there for three-plus hours. This station, however, had a single large-screen TV in the lobby, and it was turned to the local then-WB station, KXVO (Channel 15). Besides the informercials and cartoons, it was an utterly-boring experience.