Television in the United States Gray Television, whose 131 stations cover mostly smaller metropolitan areas reaching only 10% of the population. The five major U.S. broadcast television networks are the National Broadcasting Company (NBC), CBS (formerly known as the Columbia Broadcasting System), the American Broadcasting Company (ABC), the Fox Broadcasting Company (Fox) and the CW Television Network. The first and elder three (which are colloquially known as the "Big Three") began as radio networks: NBC and CBS respectively began operations in 1924 and 1927, while ABC was spun off from NBC to Edward J. Noble in 1943 as the Blue Network during FCC inquiries over
History of WFAN chains operated by the National Broadcasting Company. By 1928, WEAF was purchased by NBC's parent company, the Radio Corporation of America. As a result of the North American Regional Broadcasting Agreement of 1941, WEAF became a clear-channel station and could be heard across most of the eastern half of North America at night. In 1943, the United States Supreme Court, citing antitrust concerns, ordered RCA to sell off one of its radio networks. The company decided to keep the Red Network, and it was rebranded as the NBC Radio Network after the Blue Network was divested to Edward J. Noble.