Off the top of my head (in the Hartford area):
104.1 changed from modern alternative rock to rap, then back (sort of). The problem now might be that modern rock has gotten whinier.
105.9 changed from classic rock to... I'm not sure. some late 80'ssome 90's, some 00's light rock, pop, worksafe stuff.
106.9 seemed to have an issue with the way modern rock was going, so they switched to classic rock-ish, but you only hear a few big hits from each classic band, plus stuff that's not really classic or rock. Sorry, Billy Idol, you will never be classic rock.