The installation instructions make it fairly clear that for the antenna to function as intended it must be well grounded to the wing. To do this, the instructions say you should sandwich the grounding strip of the antenna between the fiberglass wingtip and the wing skin. I realized last night (yes, I'm building in my sleep too) that this is physically impossible. The wingtip fits inside the wingskins, and the antenna is inside the wingtip, therefore it isn't possible to sandwich the grounding strip between the wingtip and wingskins. Since there are others flying with the same antenna, how have you guys grounded the antenna? Are you simply relying on the nut plate screws that penetrate the grounding strip to be adequate? Perhaps rivet the antenna grounding strip to the wingtip by sandwiching the grounding strip between the nutplates and wingtip?