Here's a summary of the Wikipedia article about WCGW:

WCGW (770 AM) is a Christian radio station licensed to Nicholasville, Kentucky, and primarily serves Central Kentucky. The station broadcasts a mix of Southern gospel and country gospel music to its listeners. Uniquely, WCGW goes off the air every day from sunset to sunrise. This operational practice is crucial to protect the nighttime skywave signal of WABC in New York City, a powerful Class A station that shares the same 770 AM clear-channel frequency.