Thus there are four more 3.3 mm holes around the centre of the support disc, and two 3.3 mm holes in the boom. Obviously two angle brackets face forwards, and two face rearwards, otherwise the through-boom screws will foul each other. This comprises several components. He might have added, nor is there ever likely to be. This is not a marketing problem, it's an electrical one.
Any antenna necessarily has to be some distance away from the radio.
This wipes out the advantage of S-band, which is the almost total absence of ambient noise. So there has to be some receive electronics at the feed, such as a receive pre-amplifier or a converter, 2.4 GHz to 144 MHz for example. This denotes 2400-2402 MHz, as distinct from the 2304 MHz version. This time Murphy was on my side. It just so happens that the corresponding connector on the converter is 15 mm from its edge too.