KCSJ (590 AM) is a Class B regional radio station licensed to PUEBLO, CO. Operating with 1 kW daytime power using a directional (different day/night patterns) antenna system with 3 towers. At night it operates at 1 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 Talk radio format.