My guess is the Antenna is amplified and not grounded solid enough. I've encountered this mostly with aftermarket radios that are installed with no ground wire. There would be a nut on the interior side of the roof just and above the headliner that secures the antenna and grounds the signal...
Adding Aftermarket Sub to Equinox
This vehicle has a subwoofer in the back that reproduces the engine and cabin noise picked up from an interior front and rear mounted microphone out of phase in an attempt to cancel it out, similar to noise canceling headphones. In fact, the base model equiped...
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