The Denver Broncos have one of the best home field advances in all of sports by simply just playing in Denver. The high altitude in Denver makes it more difficult for visiting teams to play there. In addition, the Broncos have a very passionate fan base. In fact since 1970 the Broncos have sold out every home game in a non-strike season. In 1987 two games were not sold out due to the player’s strike. With the exception of a few games played at University of Denver's Hilltop Stadium, the Broncos have played home games in only two stadiums.
In 1960 the Broncos began play in Mile High Stadium and played there through the 2000 season. Mile High Stadium began has a small 18,000 seat stadium that was built on a former landfill. However, the stadium underwent expansions in 1959, 1968, 1976, 1977, and 1986. After 1986, the stadium had a capacity of 76,273. The 1968 expansion was the result of the NFL-AFL merger. The stadium was closed on December 23, 2000 and demolished on April 17, 2002. In 2001 the Broncos moved into INVESCO Field at Mile High, which was renamed Sports Authority Field at Mile High in 2011. Many traditions that originated from Mile High Stadium have found their way to Sports Authority Field. Bronco fans still use the "Incomplete Chant" after each incomplete pass by the opposing quarterback. Additionally, the Broncos still continue the tradition of selling out the stadium. The Broncos have sold out every game in at Sports Authority Field.