Re: 107.5 in Seymour, IN-
It was actually a very weak WRVW- Lebanon, TN and WABX- Evansville, IN mix. WRVW is helped out threefold by terrain, tall tower and open frequency and was doable several miles beyond the other Nashville stations. To put it into perspective, 101.1 WUBT Russellville, KY, a monster signal in it's own right, operates from a tower a good 20 miles north of Nashville and still doesn't make it to Elizabethtown (100 miles approximately)
WIOK- Falmouth, KY didn't make an appearance until between Louisville and Elizabethtown on Interstate 65, and even then it was very weak and very brief before the aforementioned WRVW took over the frequency.
WZRX, WGPR and WGCI weren't until well north of Indianapolis on I-69.