Above ground and near the the cable duct entry point is a very strong blockhouse with a couple of small radio masts fixed to it. The masts are a recent addition and carry traffic for local companies. The whole building is obviously designed to withstand a great deal of punishment and the roof is re-inforced concrete. latest investigations seem to indicate that the radar head would have been on top of this roof and would have been part of a Type 14 installation.
It is thought that the building itself once housed part of the radar aerial control gear for the Type 14 and anything inside would certainly have been well protected. The door to this building is a massive steel and concrete construction that runs on rails at 
the top and bottom and the whole is obviously designed to be massively strong. There are four steel feet bedded in concrete just beyond the corners of the building. These were originally assumed to be the feet of a gantry helping to support a radar array but there is no evidence for this assumption. They may even be a remnant from the earlier CHL station and the concrete base might have been re-used for the new radar. Some of them have been used for staying more recently installed masts.
No actual photographs are available, to me, of the ROTOR radar array at Truleigh but this unattributed picture of a similar installation shows how it might have looked. I regret I do not know the source or copyright status of this.
