Wikipedia
WSON (860 AM and 96.5 FM) is a radio station in Henderson, Kentucky broadcasting a classic hits format. The station is currently owned by Henson Media and features news, sports, weather and music features programming from ABC Radio News and Westwood One, as well as locally produced programming. The station can be heard during daylight hours in neighboring Evansville, Indiana and Owensboro, Kentucky.
WSON first signed on ten days after the attack on Pearl Harbor, and has been locally owned for its entire history. For most of its first four decades on the air, WSON was a daytime-only station, signing off at sunset in order to protect CJBC in Toronto. However, a treaty between the United States and Canada signed in the mid-1980s allowed WSON and other daytimers, that went off the air to protect Canadian clear-channel stations, to begin nighttime operations as well. WSON must use a directional antenna from sunset to sunrise, with the signal oriented to the southwest.