The 1510 AM frequency originally signed on as WAUX and later was the original home of the WAUKcall sign until February 12, 2008. They had been a sports talk station since the early 1990s and the previous home of ESPN Radio. Prior to sports the station had a smorgasbord of formats, including variations of adult contemporary, country music, and talk. WAUK was also the original sister station of Waukesha-licensed WMIL-FM (106.1), which launched as WAUX-FM and later became WAUK-FM before a sale to another party in the late 1970s.
WRRD is limited to operating between sunrise and sunset. As a result, the station leased time from WMCS to carry the full ESPN Radio schedule between 6:00pm and 6:00am.
That arrangement ended after Good Karma Broadcasting moved the WAUK sports format to its new, full-time frequency of 540 kHz, the former home of Salem Broadcasting religious outlet WRRD. The WRRD calls then migrated to the 1510 kHz frequency.