behind the south end zone seats, would have been restricted by completely enclosing the south end of the stadium. Secondly, any enclosure would have forced the baseball field, which shared its outfield with the practice fields until 1982, to shorten its left field line considerably. More permanent seating was added, this time to the east side, in 1929. In 1949, the north end of the stadium was enclosed, the playing area was lowered six feet with the elimination of the running track around the field. This created a 55,000-seat "horseshoe," and the addition of south end bleachers in 1957 brought capacity to just under 61,836 fans. AstroTurf replaced the natural grass field in 1970. The west side upper deck was added in 1975, featuring a lounge and a new press box, for a total capacity of 71,187 fans at a cost of about $5.7 million. Improved south end zone seating, including new coaches' offices and training facilities, was added in 1980 and the old turf was replaced with Superturf in 1981. The new turf was more or less a necessity; the old surface had literally become threadbare. With a few exceptions, these changes took place during or shortly after the Sooners' national championship seasons of 1950, 1955, 1956, 1974, and 1975 – all high times for Sooner sports. Lights, camera, football, money Up until the 1980s, the NCAA had a tight grip on television contracts for Division I-A college football games. Compared to the current plethora of college football games on television, only two (on rare occasions, three) college football games were televised each week and the schedule of games was set in stone well in advance of the season opening. The NCAA reasoned that televised games cut into attendance, and more TV games would cost more money in lost gate receipts than could be gained with television contracts. In the fall of 1981, OU and the University of Georgia sued the NCAA in federal court in Oklahoma City. In this class-action lawsuit on behalf of members of the College Football Association, the two schools alleged that the NCAA's contracts with ABC, NBC, and CBS violated the Sherman Antitrust Act by preventing each college and conference from selling its product on the open market. The court agreed with the schools in 1982 and voided the NCAA's television contracts. However, the ruling was appealed by the NCAA and finally heard by