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I tinted my windshield with 80% and must say that it is a huge improvement. I know it is illegal in most states and probably mine...but it came highly recommended and I cant believe the difference in glare reduction and heat dispersion. I highly recommend it!
GPS antenna is above the radio/above above the duct, and towards the steering column a few inches under the dash.
So problem is some of the cheaper metallic tints that have enough metal in them, that it blocks/ interferes with the GPS that is getting it signal through the windshield.