This image is that of the television antenna of station WNBT and for many years it sat on top of the Empire State Building. WNBT was the flagship station of NBC, which was owned by RCA (Radio Corporation of America, 1919-1986) which (according to its name) was really the first national broadcasting radio network in the United States, and which (as experimental station W2XBS) became the first to broadcast a television picture (of a papier mache Felix the Cat) in 1928. This fantastic cover art for a 1947 promotional for the company pictured the famous antenna, the great visual of the company's external hardware, right there on top of the world's tallest building.
This was really a picture of the future, and in 1947 the future of mass communications and entertainment (and in making money in the two) was seen in television, much more so than the formerly gargantuan radio.
The original pamphlet, (12x9", 44pp, illustrated) is also available and is in excellent condition. $95