1st US transcontinental radio telephone message

On October 22, 1915, the first U.S. transcontinental radio telephone message was successfully sent from the U.S. naval radio station in Arlington, Virginia, to the naval radio station at Mare Island in San Francisco, California. This historic achievement demonstrated the potential of radio communication to span vast distances without the need for physical wires. The successful transmission showcased the advancements in radio technology and its applicability for both military and civilian communication. This milestone was a significant step in the development of long-distance radio communication, paving the way for future innovations and the widespread use of radio telephony.