From the NMR:
A Coastal Defence/Chain Home Low (CD/CHL) radar station located at North Foreland (TR 398 695), called site M5. Coastal Defence/Chain Home Low (CD/CHL) radar stations were operated by the British Army to detect shipping and aircraft. CD/CHL sites opened from spring 1941 and comprised a brick or concrete operations block with an aerial gantry mounted on the roof and a separate standby set house for the reserve power. Staff were billeted where possible, but some stations had a small layout of domestic hutting situated within one mile of the site. From 1942 CD/CHL sites were combined with the Royal Air Force's Chain Home Low (CHL) sites to form one system of low-cover radar under the control of the RAF. Selected stations were upgraded with centimetric radars to become the K-series of Chain Home Extra Low (CHEL) stations. This improvement in radar technology meant that fewer stations were needed to give the same coverage and as a result many CHL and CD/CHL stations not upgraded were closed. North Foreland station was upgraded to a CHEL site in 1942, called site K5.

Coastal Defence/Chain Home Low station at North Foreland. Aerial photography from 1979 shows that the station had been removed and the site given over to agricultural use.

<1> Dobinson, C, 2000, Twentieth century fortifications in England, volume 7. Acoustics and radar: England's early warning systems 1915-1945, p130, 167 (Bibliographic reference). SWX23709.

<2> Anderton, Michael J., 2000, Twentieth century military recording project: World War Two radar stations, p89 (Bibliographic reference). SWX23713.