I haven't re-tested bluetooth phone calls yet. Now that I know where the fuse(s) are I want to be ready with spares before testing.
As for the GPS antenna: I just used double sided sticky tape and left it installed underneath the dash cover (the one held on by two 1/4 turn screws). Plastic does not block GPS signals (much the same as fiberglass doesn't block them either) thus I shouldn't see a decrease in navigation performance with it hidden away.