Multiple Television and Frequency-Modulation Transmitting Antenna Installation on the Empire State Building

This paper describes the objectives, mechanical and electrical problems and solutions, and final performance of the multiple antenna system for television and FM broadcasting on the Empire State building in New York City. A specially built steel tower supports six individual antennas from which there are transmitted five picture carriers, five sound carriers, and three FM broadcasting carriers with completely satisfactory freedom from the effects of mutual coupling. The paper describes the planning, execution, and results of extensive preliminary field laboratory work during which much basic information on such systems was obtained through the use of full-scale model antennas.