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Marconi sent & recieved the first radio signal in 1895. It's debated whether or not he really came up with the idea.
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In 1906, Lee de Forest discovered the Audion tube. It's widely believed that Reginald Fessenden came up with the idea and had it stolen from him.
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KDKA, the first radio station, broadcasted on November 9th, 1920 as 8XK.
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In August 1922, the first commercial aired on a radio station. It was an advertisement for a telephone company that lasted 10 minutes.
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The Federal Radio Commission started as the result of too many personal radio stations popping up.
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Radio stations started doing shows for entertainment during the Great Depression.
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The FM transmitter increased quality of radio, but forced people to buy new boxes to listen to it.
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Shows started moving to TV and less people started listening to the radio
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