KZSF (1370 AM) is a Class B regional radio station licensed to SAN JOSE, CA. Operating with 5 kW daytime power using a directional (different day/night patterns) antenna system with 4 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 Carlos A. Duharte. It broadcasts a Regional Mexican format.