A transmitter block for the Chain Home radar station of RAF Stenigot (see PRN 43220). Construction began in 1938, with the block being built of brick with a flat reinforced concrete roof. Stenigot was one of twenty sites along the east coast of Britain which had been chosen as 'Advanced' stations by September 1937. The transmitter and receiver blocks (see PRN 47955) and towers (see PRN 47956) - of which the surviving example is the most complete to have survived on any of the Chain Home stations - had been completed by 1939. The transmission and receiving of radio waves were essential functions of radio direction finding equipment (radar), and the operation of both were based in buildings surrounded by blast walls for defence against air attack. This station was a 'type A' site, and was modelled on the standard layout established at Bawdsey Experimental Station. For the full description and the legal address of this listed building please refer to the appropriate List of Buildings of Special Architectural or Historic Interest. {1}