Passive antenna, No need for batteries. ^^ Fully adjustable indoor antenna for the AM broadcast band [530-1710 KHz]. ^^ Just place the loop beside the Radio Set (Inductive coupling), or use the cord included to connect your radio with antenna to improve reception. ^^ The large base makes it easier to emplace onto a flat surface, and small radios can be placed inside of the antenna to get significant signal improvement. ^^ Including a 32" long connecting cable.