WDER (1320 AM) is a Class B regional radio station licensed to DERRY, NH. Operating with 10 kW daytime power using a directional (different day/night patterns) antenna system with 4 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 Blount Communications. It broadcasts a Christian radio format.