Soldatensender Calais (G.9) (German: [zɔlˈdaːtn̩ˌzɛndɐ kaˈlɛː], Soldiers' Radio Calais) was a British black propaganda broadcaster during the Second World War operated by the Political Warfare Executive. It pretended to be a station of the German military broadcasting network. The station was in operation between 14 November 1943 and 30 April 1945, when it ceased operations.
Soldatensender Calais operated on the mediumwave band on 833 kHz (360 metres), 714 kHz (420 metres), and 612 kHz (490 metres), with an associated shortwave station Kurzwellensender Atlantik created to broadcast to U-boat crews. The station used a 500 kilowatt transmitter originally built for American broadcaster WJZ, in Newark, New Jersey. This transmitter had lain unused at the factory after the United States Federal Communications Commission imposed a 50 kW power limit on all U.S. stations, and so RCA was glad to sell it overseas and the British Secret Service bought it for £165,000. Codenamed Aspidistra, it was installed in a huge, underground bunker near Crowborough in Sussex, England, where it was briefly the world's largest medium wave station, perfect for deceptive "black" operation.
Soldatensender Calais operated from 6 p.m. local time to dawn. Unlike its predecessor Gustav Siegfried Eins the programmes were live from the purposely-built broadcast studio at Milton Bryan in Bedfordshire and presented by Agnes Bernelle using the codename "Vicky".