WTKM-FM airs a full service radio format of classic country music, with local news, weather, talk and high school sports.
The transmitter is on West Waterford Road in Hartford, shared with its sister station, WPTT 1540 AM.
That allowed WTKM to apply for an FM license on 104.9 MHz to simulcast 1540 AM, which is a daytimer station, required to go off the air at night.
The Milwaukee area has a number of residents who trace their histories to Poland and other Eastern European countries where polka music is popular.
The stations had a fiercely loyal listener base where some fans built special antennas just to receive their signal.