Radio War: The Secret Espionage War of the Radio Security Service 1938-1946During the Second World War German intelligence had deployed wireless teams throughout occupied Europe. Agents had even been deployed to mainland Britain to spy on British military activity. Monitoring and reporting of their wireless transmissions fell to a small, secretive and largely unknown unit manned almost exclusively by volunteers. The Voluntary Interceptors (VI) as they became known would spend hours every day at home monitoring the short