Well, obviously the true heritage station is indeed WPFM. In fact, it has NEVER been anything but some form of rock format (AOR, new rock, new wave, Top 40, CHR, AC) since a few years after signing on back about, uh 50 years ago....hard to imagine. I thunk it qualifies for probably one of a few dozen stations to never have flipped to a completely different format like Talk, Country, Jazz, etc.)
Sunny would probably qualify for the heritage status as being AC since the Woodfins owned it. Like most FMs stations, they were variety or classical formats in the beginning when AM ruled. Sunny was EZ listening for many years. PAP of course for country.
Cause I can't scroll down on this on my iPad - and I am editing - WNCV didn't sign on until I think around the early 90's. It was like 3kw and crowded out, but was lite AC. Wave has always been pretty much some form of rock, even back with the true owner of it, the Carters, had it. Can't recall it ever being another format like country, etc.
80s additions: Island 106 has been WILN for many years. I guess, 97.7 would qualify as being mostly a rock station since the mid-80s. Then you would probably have to throw WRBA into the mix. It was AC for a while before going Classic Rock. All this subject to memory failure.