In the 1930s worries were growing about the availability of useful radio spectrum. The use of microwaves was therefore proposed, with which many channels of speech may be combined onto one carrier frequency. Alec Reeves was part of the team installing a link between London and Paris and went out an a rowing boat to determine how the beam behaved across the English Channel. He noted that the signals were reflected from the cliff face. Had he the time to persue these observations, he could have developed a radio detection and ranging system - radar.