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Royal Air Force Ventnor or more simply RAF Ventnor is a former Royal Air Force radar station located north east of Ventnor on the Isle of Wight, England. It was initially constructed in 1937 as part of a World War II coastal defence programme codenamed Chain Home. The site played an important role during the Second World War, providing early warnings of incoming attacks carried out by the Luftwaffe.
The site was also part of the ROTOR programme in the 1950s as a Centimetric Early Warning (CEM) station, keeping a constant watch for suspicious Soviet Union . During the time, an extensive bunker complex was also built at the site, which would later be converted for use as a shelter in case of a Nuclear warfare during the Cold War. Most of the buildings and facilities at the site have since been demolished, with the bunkers now sealed shut following unauthorised access.
On 12 August 1940, four Chain Home stations were targeted for bombing by the Luftwaffe, including RAF Ventnor. The radar station suffered considerable damage with most of the buildings being damaged or destroyed. However, casualties were light with only one soldier being injured. Following this attack, a mobile installation were set up and remained in operation until the station was repaired.
The site played an important role during Operation Overlord, the codename for D-Day, monitoring both ship and aircraft movements involved in the landings. From June 1944 onwards the station was active in detecting incoming German V-1 flying bombs.
By November 1947, Ventnor was one of 26 radar stations still in use in the UK with the Type 24 long range microwave height finder and Types 52 and 53 radars still operational.
The site (codenamed OJC) was operated by the No.23 Signals Unit under the control of the Ground Control Intercept (GCI) station RAF Sopley. In 1952 the site was remodelled as one of seven underground Centimetric Early Warning (CEM) station, designed to provide more accurate information on the height, range and size of an attacking force compared to the World War II Chain Home radar stations. The bunkers, made of ten feet thick reinforced concrete, housed RAF workers who kept a constant watch for any suspicious aircraft up to 300 miles away. Most of the radar operators and technical personnel working at Ventnor at the time were teenagers, serving their period of compulsory National Service.
By the end of 1956, the AMES Type 80 had been added to the site. Ventnor remained operational until 1957 before being placed into care and maintenance.
Until the 1990s, the site was involved in the detection and interception of intruding Warsaw Pact aircraft, using the Marconi Type 264A radar and secondary surveillance radars.
The operations bunker was refurbished as the Isle of Wight Council's Control Centre and remained in operation until 1991 as the Isle of Wight Emergency Command Centre for command and control of the island in-case of a Nuclear warfare.
The surviving components of the original 1938–1939 Chain Home radar station, such as the receiver building, the three receiver tower bases and any remains of the former station defences including a pillbox, is considered a Grade II listed building for their "architectural interest and degree of survival" and for their "historic interest (history of radars)."
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