Relay tower

Relay towers, or relay beacons, were electrically powered structures meant to recieve, reinforce, or retransmit a broadcast or program through long distances without a physical connection between one or more people. Several of such devices were located on the Outer Rim planet of Serenno, used by the charismatic Sith Lord Count Dooku to transmit messages from his palace to his affiliates on and off the battlefield during the Clone Wars.