Marconi National Historic Sites of Canada Marconi National Historic Sites of Canada The Marconi National Historic Site and the Marconi Wireless Station National Historic Site are two National Historic Sites of Canada located on Cape Breton Island, Nova Scotia, Canada. Both sites commemorate the efforts of Guglielmo Marconi to transmit transatlantic radio signals between North America and Europe in the first decade of the 20th century. The two sites are located within approximately of one another, and are connected by the Marconi Trail. Signal Hill in St. John's, Newfoundland and Labrador is another National Historic Site related to Marconi's work in Canada. Signal Hill was designated,
Guglielmo Marconi longwave transmissions travel much farther at night than in the day. During the daytime, signals had been received up to only about , less than half of the distance claimed earlier at Newfoundland, where the transmissions had also taken place during the day. Because of this, Marconi had not fully confirmed the Newfoundland claims, although he did prove that radio signals could be sent for hundreds of kilometres, despite some scientists' belief that they were limited essentially to line-of-sight distances. On 17 December 1902, a transmission from the Marconi station in Glace Bay, Nova Scotia, Canada became the world's first