These Chain Home Low stations consisted of two separate aerial arrays, one of the transmitter and one for the receiver, mounted on 20 foot high wooden gantries, with the equipment housed in a hut undeneath each gantry. Since C.H.L. operated on a wavelength of 1.5 metres the aerials were short enough that the arrays could be rotated, which was done by hand. It was not until well after the Battle of Britain that power turned, single arrays (which combined transmitting and receiving) were introduced.
The performance of C.H.L. can be seen from the following data from 1940:
Aircraft Height / Detection Range
25 - 30 miles
1,000 feet - 40 miles
2,000 feet - 50 miles
4,000 feet - 55 - 60 miles
15,000 feet - 107 miles
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