How it all began
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LONG WAVE
Until 1924 the BBC had been providing local programmes on medium wave. In June 5XX, a new experimental transmitting station at Marconi's Chelmsford site, was opened using the long waves enabling the BBC to be heard over most of the country and also overseas with the alternative National Programme. This enabled people in Britain, who were beyond reach of a local medium wave transmitter, to hear the BBC. The experiment was deemed a great success and a permanent site at Daventry, Nothamptonshire, a more centralized location improved coverage across a greater area of the UK. By this time there were over 1½ million radio receivers in use, many were still crystal sets, but valved radios which could amplify the signals enough to enable loudspeaker operation, though more expensive, gradually gained popularity. 
With the new 5XX Daventry station in operation the BBC experimented with stereophonic broadcasts for the first time with a concert from Manchester being broadcast from all transmitters. Left: The 5XX Long Wave Transmitting Aerials
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