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Heinrich Hertz proved you could transmit and receive electric waves wirelessly.
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First transatlantic message FROM the US was in 1903, when a Marconi build station sent a message from Massachusetts to the UK
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The AUDION tube was the very first amplifier to help push waves further and further by providing power to the signal
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KDKA (1020) in Pittsburgh becomes the very first radio station in the US
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WEAF aired a 10 minute broadcast for an apartment complex charging $50
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This is when the diversity of radio shows exploded - music, comedy shows, plays, dramas