Because 1070 AM is a clear-channel frequency reserved for Class A station KNX Los Angeles, at night, to avoid interference, WTSO must reduce its power to 5,000 watts and use a directional antenna with a six-tower array.

In afternoons, Mike Heller, Drew Olsen, and Kevin Brandt host shows focused on Wisconsin and national sports.

WTSO's live sports coverage includes broadcasts of Chicago Cubs baseball, NASCAR races from MRN Radio and PRN Radio, as well as local high school events, including championships in the Wisconsin Interscholastic Athletic Association.

WTSO also airs live broadcasts of some University of Wisconsin Badgers games along with sister station WIBA 1310 AM.

As country music listening switched to the FM dial, WTSO tried a talk radio format and later adult standards.

On January 1, 2009, WTSO parted company with ESPN Radio and rebranded as "The Big 1070, Madison's Sports Station."