Set up 420 foot tower and similar station in Scotland for the first two way trans-Atlantic telegraph

Following years of experimentation, during which time he suffered the ridicule of those around him, he stunned his detractors on December 23, 1900, by successfully transmitting the sound of a human voice between two 50-foot towers on Cobb Island in the middle of the Potomac River near Washington.

On Christmas 1906 Reginald Aubrey Fessenden realised the first public voice broadcast ever at his Radio-Telephone Installation at Brant Rock. Because of this his name is often mentioned in relation to the invention of the radio. But, as Dave Riley notes, there's more to this man who also built the first power generating station at Niagara Falls and developed the fathometer.