Marconi claimed to have received the first transatlantic wireless signal, the Morse code letter 'S,' at Signal Hill in St. John's, Newfoundland, sent from Poldhu, Cornwall, England. This claim was initially met with skepticism but later validated. The equipment was designed and constructed by John Ambrose Fleming.

Marconi established a permanent transatlantic wireless communication station in Glace Bay, Nova Scotia, further proving the feasibility of long-distance wireless communication. This achievement revolutionized global communication.

Marconi's company launched the first commercial transatlantic wireless service between Clifden, Ireland, and Glace Bay, Nova Scotia. This marked a significant turning point, making reliable long-distance communication a reality.