much of the site is devoted to the enormous overhead wire antenna array that is necessary to efficiently radiate the vlf waves. the antenna, shown above, consists of ten catenary cables, 5,640–8,700 ft (1,719–2,652 m, 1.1–1.6 miles) long, suspended on twelve 200 ft. towers overlooking the valley between wheeler mountain and blue mountain in a zigzag pattern. each cable receives energy from a vertical cable attached at the center, which drops down to the valley floor where it is fed by one of two "bus" transmission lines which extend along the valley from the transmitter building in the center.