The "Protector, Aerial Base" for Base No.9 was a late addition to prevent the base being destroyed by low branches, etc. A large number of them would have been made up "in theatre" out of materials in hand, so the actual construction could vary considerably.
I think the "BRACKETS AERIAL CLAMPING No.1 T. ZA29558" is for fitting an elevated aerial base to the top of a 'D' rod, since it looks very similar to the "F" rod adapter for the the British 34-ft mast. It's odd in that it has four slotted lugs, which would not appear to match up with the usual aerial bases, and is quite late from its stores code - late 1944-ish. It looks as though it's intended to be rotated onto some studs for clamping, but I don't really see why. It certainly won't fit any of the usual bases, though possibly the No.3/No.16 combination for radio trucks - but the reason for it escapes me at the moment.
Chris.
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