WMSW (1120 AM) is a Class B regional radio station licensed to HATILLO, PR. Operating with 3 kW daytime power using a directional (different day/night patterns) antenna system with 3 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 Aurora Broadcasting Corporation. It broadcasts a News radio format.