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Unlikely that the antenna itself is causing an issue.
At worst it would fail to pick up the satellite signals but it would not block other devices nor generate an interfering signal.
It sounds like that there is something in the car emitting interference.
Grab a gps satellite tracker app and while using it walk away from the car at various points in a circle.
You could use it to build a map of sorts to help you pinpoint where the interference is originating from... or a signal scanner could be used...
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