1st Radio AM broadcast
Marconi’s first transmission relied on amplitude modulation to send a ‘wireless telegraph’ from England to Newfoundland. The transmission ‘bounced’ off the ionosphere and was received in Canada. Marked the first time in history that information encoded in radio waves had been sent and received successfully over a significant distance.
Melrose, John. "Fessenden and Marconi: Their Differing Technologies and Transatlantic Experiments During the First Decade of This Century." Radio's First Message -- International Conference on 100 Years of Radio. September 6, 1995. Accessed December 3, 2015. http://www.ieee.ca/millennium/radio/radio_differences.html.