Once radio signals could be transmtted and received with improved clarity around 1920, the idea of public radio began to take hold in America. The first public radio broadcasting station opened in Pittsburgh, 1922. It was an instant success; listeners would sit around the radio listening to everything that was broadcasted. As a result many more radio stations popped up during the 20s, some even over night.
http://entertainment.howstuffworks.com/radio-show.htm
Arguably the first massive media, radio became instrumental in providing information and entertainment in homes across the United States after the World War I. Radio programming grew in popularity through the Depression because it was virtually free and tied listeners around the nation into national events, local news, music and entertainment programs without requiring they spend money on going out. What's now considered the age of golden radio -- the 1920s through the end of the 1950s -- spawned a spate of entertainment shows and genres that still resonate in other mediums today.
http://www.vintageperiods.com/
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