Hi Peter
I don't have the UK Racal mast, what I have is an incomplete AN/RC-292 (missing the antenna assembly), we've made an adapter to fit the pineapple into the tubing of the mast. The antenna elements are very similar to the AN/AS-1729 elements.
The antenna connection is a BNC
We're erecting one of the masts as one end of a long wire dipole off the Macquarie Lightouse at Vaucluse for International Lighthouse Lightship weekend in conunction with VK2BV. I was considering sitting the pinapple on the top to see how it functioned, yes I have the antenna elements.
Diana
VK2F VRC