A campaign has begun to get two large transmitter masts listed, after the BBC's Long Wave (LW) service is turned off. The 700ft (213m) high Wychbold Masts in the Worcestershire countryside can be seen for miles and are often used as a landmark for drivers on the M5 near Droitwich. They have been in use since 1934 for sending the signal across the country, as well as for transmitting important messages during the World War Two.