From BR Bullpen

KDKA (1020 AM) is currently a news/talk radio station located in Pittsburgh, PA.

KDKA started broadcasting on November 2, 1920, as the first commercial radio station in the United States. In 1921 the station had the first broadcasts of Major League Baseball games. On August 5th of that year, Harold Arlin became baseball's first play-by-play announcer when he detailed the action of the Pittsburgh Pirates beating the Philadelphia Phillies at Forbes Field, 8-5.

KDKA broadcast Pirates games for about eight decades before changing its format.