History of the National Football League on television
NBC was the first major television network to cover an NFL game, when on October 22, 1939, it broadcast a game between the Philadelphia Eagles and the Brooklyn Dodgers; the network was still only in its infancy, with only two affiliates, the modern day WRGB (now a CBS affiliate) in Schenectady and W2XBS in New York City. Portions of that game still survive via films, but the film is not footage from the telecast (recordings of television broadcasts did not begin until 1948). The use of a sideline camera, the sole camera used in the 1939 broadcast, would become the standard for all future NFL broadcasts until 2017; the angle is particularly suited for estimating yardage, compared to more mobile camera angles that began to appear in the 21st century.
Television in the United States
The major professional sports leagues began regular television broadcasts in the 1950s. The National Football League (NFL)'s embrace of television broadcasting at the early onset of the medium helped boost its popularity as a sport, and by the 1960s, the combined success of NFL and American Football League (AFL) telecasts helped earn professional football a status as a mainstay of the major television networks. American television pays the NFL billions of dollars each year to maintain their television rights; the Super Bowl, in return, is a cash windfall for the network which airs it as the broadcaster which holds the rights in a given year (which is rotated annually among the broadcast networks that hold rights to the league's regular season and playoff games) can make hundreds of millions of dollars in revenue from advertising sales alone. Major League Baseball (MLB) has been televised on U.S. television since the inception of the medium, most notably by way of a "Game of the Week" that has usually aired on Saturdays on various broadcasters since 1954.