I am curious about the Model S coated windshield (the one that is causing problems with EZ-Pass, Door Openers etc.) and wondering what the coating is for. A few years ago I recall (I think) Lincoln used a coated windshield that was blocking RF like this. In that case, the coating was conductive and used for front defrosting. I noticed that there does not seem to be a front defroster vent on Model S (there is what looks like a speaker grill across the bottom of the windshield) and so wonder if that is the case here? If not, I'm not sure how you would get ample airflow across the windshield from a "standard" defroster.