Cage aerial

Historic Radio Engineers Club station, Riverhead, New York, in 1922; a cage T-antenna 60 ft high by 90 ft long. The conductor is made of a "cage" of 6 wires held apart by wooden spreaders; this increased capacitance and decreased ohmic resistance. This antenna achieved transatlantic contacts on 1.5 MHz, at a power of 440 W.

A cage antenna (British cage aerial) is a radio antenna where a conventional design has been augmented by replacing a single long conductor with several parallel wires, connected at their ends, and held in position by ring spacers or support struts mounted on a central mast (if any). The "cage" is either mounted around a central mast (either conducting or non-conducting) or suspended from overhead wires.