I also wondered about the Antenna swap, I was dissuaded for doing it, due to some comments made about tuning etc. I may also still do it or at least try it, depending on the factory ring antenna performance. Through Windscreen was my original thought, but I am swaying more towards putting it behind the wing mirror, so just through plastic which SHOULD give it a better chance of reading, plus I will probably put the momentary button on the underside. If I manage to get my testing done before you, I will update you as to the performance differences…if any
This was from turbo2ltr when I suggested the antenna swap
FYI, I looked for seperately sold xAC antennas but came up dry, feel free to have a look, you might have better luck, I was going to just grab another xAC to take the antenna from it