They may well remember channel 48, but how many people would remember this many years later the call letters? You know, average folk, not like us. (And how many fewer would remember/care that it was licensed to Burlingont?)
I do think it's funny that all of us nerds think average people remember stuff like that. I would venture to say no average viewer ever turned to his wife and said, "Honey. Do you think it's weird that WKBS's ID slide has the word 'Burlington' on it?" All anyone cared about then was that a good "All in the Family" rerun was on and the picture was clear enough to enjoy it!
Even though it almost never means anything to the listeners, getting certain calls that have some sort of meaning is fun and interesting to nerds like us. And let's face it: The people who run these radio stations are
complete nerds!