so you were the one who bought these at the recent grays auction. I used to work with these, they are uhf/vhf, but unfortunately they are incomplete. There is another attachment for the 4 captive screws on the plate. They were used by sigs in RR and CSA dets. In another lot someone got the the 3 x Radios, was that you? The were mounted on pump up masts. Made by Tadiran and developed in Australia for the ADF by BA.