I wonder if BG was originally in the Nashville market and WBKO ended up joining ABC in the late 1960s as Nashville and Louisville had weak ABC affiliates at the time.
Bowling Green was indeed in the Nashville market at one time. It doesn't appear as its own market until the 1978 Broadcasting Yearbook, and even then, in several years it was comprised of non-contiguous counties. As of 2018 it was a small cluster of six counties to the north and east of Bowling Green, mostly cannibalized out of the Nashville market.
