So easy , it took me months years to come to grips with the model . It was the SAME issue as I tried to work out to build the bedstead aerial . it was one of those 45 am dreams of model boats and I just made a BALSA plug and bent wire around it and then soft fuse wired the top prongs together and the bottom prongs together. I soldered the whole top thicket of wire twigs and the bottom twigs then with my dremel cutting disc cut each twiggy mess away and then shaped the top and bottom similarly and had a wire well shaped BASKET skinny and vertical and SCALE. I picked out the hard balsa plug and soldered the mast and mounting apparatus etc . Well the rest of the model was a dream with a super tiger 21/23 for years and now an OS 25 FSR and she is probably 20 years young now . Regards Lyle. I will try for pics

Sorry I cannot be much help in suggestions as to how to make the aerial. This was the aerial for the VHF comms system that was the common transmitter/receiver system used by the RAF at the time 1950's, for its time and using valves it was compact device.
When I was doing my national service at RAF Mountbatten we were just fitting the first UHF systems to the RTTL the I do not remember what the aerial looked like then although it is probable that this was never fitted to the RSLs.
In my time 1960/62 the RSLs never had any contact with aircraft and were mainly used for dingy drill for aircrew, I.e. taking pilots outside the breakwater and getting them to jump off the boat with their lifejackets on, and with an uninflated dingy, which they had to inlate and get into whilst the RSL would run up and down trying to make as many waves as possible.