ON JUNE 12th television in America will undergo its biggest change in more than 60 years. The last of the big television stations still broadcasting in analogue will turn off their transmitters and begin digital transmissions only. Half of the country’s 1,700 or so television stations that transmit their signals at full power have already ceased sending out analogue signals. But those were almost entirely in rural areas. For the majority of those Americans who get their television free over the air, this will be the big switch-off.