Guglielmo Marconi - Significance with Radio:
Guglielmo Marconi sent and received his first radio signal in Italy in 1895. By 1899 he flashed the first wireless signal across the English Channel and two years later received the letter "S", telegraphed from England to Newfoundland. This was the first successful transatlantic radiotelegraph message in 1902.
In 1909, Guglielmo Marconi and Karl Ferdinand Braun were the co-winners of the Nobel Prize in Physics, "in recognition of their contributions to the development of wireless telegraphy [radio]".
For information on all inventors associated with radio. See - The Invention of Radio
On April 25, 1874, Guglielmo Marconi was born in Bologna, Italy.