beatle
Active Member
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- Jan 13, 2026
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- Springfield, VA
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- '23 R1T, '97/25 Miatas, '19 Monkey
Depending on the vehicle, the windshield (and sometimes the sunroof) are generally the only parts that attenuate a signal, hence the cutouts. Windshields are now almost always multi-layer safety glass.
Most vehicles, including EVs, use regular tempered glass with ceramic tints to block heat. Ceramic doesn't attenuate a radio signal the way metallic tint does. I'd be wary about signal if a vehicle uses double pane glass (Lucid, Model S/X, EQS). If the Slate has double pane windows, I will eat my hat.
The vehicle's antenna signal is probably capable of being a lot stronger than the one on your phone because it's a lot bigger, not necessarily because it's outside the cabin. If you're curious about testing for signal attenuation due to the glass coating, just roll the windows down and/or open the doors and see if your signal improves.
Most vehicles, including EVs, use regular tempered glass with ceramic tints to block heat. Ceramic doesn't attenuate a radio signal the way metallic tint does. I'd be wary about signal if a vehicle uses double pane glass (Lucid, Model S/X, EQS). If the Slate has double pane windows, I will eat my hat.
The vehicle's antenna signal is probably capable of being a lot stronger than the one on your phone because it's a lot bigger, not necessarily because it's outside the cabin. If you're curious about testing for signal attenuation due to the glass coating, just roll the windows down and/or open the doors and see if your signal improves.
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