I've not detected that but I suspect the switch from Frankie Day's studio operation to whatever automation is involved (and Robert Stevens has a lot of it, for WKFB-FM, WKHB-AM and WKVE-FM) produces the cleaner sound. Or, perhaps this may be an answer: Is going from three stations at full daytime power, 2 AMs and an FM, to one nighttime AM and the aforementioned FM going to impact what goes over the combined three-station tower south of Irwin?