Where was the First Radio Signal sent from?

Guglielmo Marconi is usually credited with sending the first radio message. Marconi was born in Bologna, Italy. He came to England in 1896 and obtained a British patent for his wireless telegraphy system. In 1897 he established a radio transmitter on the roof of the Post Office at St. Martins-le-Grand in London, and sent a message a distance of a few hundred yards.

He continued to improve his apparatus and in 1898 radio was installed aboard a ship at sea, the East Goodwin lightship off the south-east coast of England. In the following year wireless messages were sent across the English Channel.

The first radio transmission across the Atlantic was on December 12, 1901 from a station on the cliffs at Poldhu, in Cornwall, and the message, three dots representing the letter S in the Morse code, was picked up at St. John's in Newfoundland.

The existence of radio waves was first demonstrated by Heinrich Hertz, a German professor, in 1887. Marconi based his experiments on Hertz's research.