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A pair of acoustic mirrors at Fan Bay is a World War II defensive structure located near Dover in Kent. The mirrors, constructed during the late 1930s and early 1940s, were part of Britain's early warning system designed to detect enemy aircraft through reflected sound waves before the widespread adoption of radar technology. Each mirror consists of a large concrete parabolic reflector positioned to concentrate airborne sounds towards a listening post, allowing operators to determine the direction and distance of approaching aircraft. The site represents a significant phase in the development of air defence technology and the evolving methods employed by the British military during the Second World War.
A pair of acoustic mirrors at Fan Bay is a scheduled monument protected by Historic England under reference 1442235. View the official record →
A pair of acoustic mirrors at Fan Bay is a World War II defensive structure located near Dover in Kent. It is designated a Scheduled Ancient Monument by Historic England (NHLE) under reference 1442235.
A pair of acoustic mirrors at Fan Bay is a Scheduled Ancient Monument, legally protected by Historic England (NHLE) — the body responsible for designating and safeguarding heritage sites in England. The official designation reference is 1442235.
Several scheduled monuments lie within 10 km, including St James' Church (3.2 km), Saxon shore fort bastion, Queen Street (3.6 km), St Martin's Church (3.6 km).
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