WTSO (1070 AM) is a Class B regional radio station licensed to MADISON, WI. Operating with 10 kW daytime power using a directional (different day/night patterns) antenna system with 6 towers. At night it operates at 5 kW. After sunset, skywave propagation can extend the signal across much of the surrounding region. The station is owned by iHeartMedia, Inc. It broadcasts a Sports radio format.