Milt, yes indeed. Never saw the inside but I believe it was fitted to Mk 1 Vs and the Canberra. As it seems, from your description, to have been for detection of a gun armed fighter it was already obsolete by the early 60s when the Anab beam rider came along.
Against guns it would have had limited success. Saw a cine film from CFE that showed a Hunter tracking a Valiant. The piper was centred on the jet pipes with the ring circling them. As he closed in the piper centred on the back of the cockpit and stayed there. The Valiant conducted a series of 'gentle' weaves at low level.
I don't know what the purpose was. Maybe to allow the AEO to track the compliant fighter. Certainly the Hunter jocks showed it to prove we were dead meat. I have no idea just what the Valiant would have been capable of in manouevre terms.
Mk 1a's and Mk 2 Vs all had Red Steer, a much larger antena housed in the large dome at the back.