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Signal Hill in St. John's was the site where Guglielmo Marconi received the first transatlantic what?

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Correct answer: Wireless radio signal

In December 1901, Guglielmo Marconi received the first transatlantic wireless signal, the letter S in Morse code, sent from Cornwall, England. He chose Signal Hill because its height allowed him to set up a long receiving antenna using a kite. Photo: Shhewitt, Wikimedia Commons, CC BY-SA 4.0.

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Source: Wikipedia (CC BY-SA)

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