Transmissions across the Atlantic

In 1900 Marconi began researching how to transmit a signal across the Atlantic Ocean. In 1901, Marconi sent a message using a 400 foot kite supported antenna. The distance between the two points was about 2,100 miles. On 18 January 1903, Theodore Roosevelt, the President of the United States, sent a messge to King Edward VII of the United Kingdom, marking the first transatlantic radio transmission originating in the United States.