The sound mirrors located in Denge were secret experiments attempting to locate aeroplanes crossing the channel back in the 1920s and 30s, back before the discovery and development of radar. The mirrors consist of large 200 foot wide mirror wall and two circular concrete dishes, a little like modern satellite dishes but from a time almost closer to the start of powered manned flight than space travel and modern global communication.
The dishes are all quite isolated, located on a small island in the marshes and gravel pits with a bridge normally closed to the public. The area is perfect for birds and and wildlife.
35 Foot Dish
DIsh and Gravel Pit