It was intended to rapidly scan the sky and quickly indicate targets that could then be handed off to anti-aircraft artillery batteries who would then aim their own gun laying radars like the AA No.
It consisted of a cheese antenna mounted flat on the roof of the operations trailer, and a semi-parabolic reflector in front of it.
The cheese produces a signal that is narrow side-to-side, about 5 degrees in this system, but very wide vertically.
The assembly was mounted on a pole that ran through the roof of the trailer and into a bearing on the floor where it was rotated by a motor.
Power was supplied by an external Meadows 27.5 kVA 415/240V three phase 50 Hz generator on a skid that was normally carried in the towing vehicle and then set on the ground during setup.