Isn't really a perfect solution, is there? Really a shame that AirFlow didn't think this all through when they put together the kit.

(I'm not blaming them, by the way; I know from experience how differences between American and international models can surprise you when it comes to accessories. I'm just saying it's a bummer.)

It would be quite a bit of careful measuring, but the other option is you could cut holes in the snorkel intake tube to allow the antenna to pass right through it. With a bit of advanced thinking you could even utilize some high-quality rubber/poly grommets to ensure that the contraption is still sealed when everything is back in place. The thickness of the antenna in the middle of the tube isn't going to effect the snorkel's flow. It would look pretty wild, but it would be perfectly usable and less intrusive on the workings and aesthetics of the rest of the vehicle.