I don't see how metallic tint would affect your radio reception. I believe the FM antenna is in the back glass, XM on the shark fin, and I don't know where the AM antenna is...usually a coil somewhere as it needs to be long since AM wavelength is so long. Even with the FM antenna in the back glass, the tint is underneath (inside the car) and wouldn't affect the antenna's capabilities.
I think what metallic tint can affect is radar detectors (operated from inside the car), and anything wireless that communicates to the inside of the car from the outside (or vice versa)...maybe the tire pressure sensors...I don't know.
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