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No radio reception when properly grounded

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Shawn

Shawn

Lifer
When the antenna wire is hooked up properly the signal is no better than when nothing is hooked up. However, if I tape over the antenna wire's outer ground with electrical tape, so only the center rod makes contact with the radio, it gets good reception. Why???

The car is an 05 Civic with an internal window antenna and the radio is a Pioneer AVIC-U310BT.
 
I could be wrong, but isn't the antenna's ground also goes to the vehicle's ground inside the radio? If so, you have grounding issue with your car because you have two separate ground planes.
 
Sounds like a short inside the antenna that is grounding the antenna to the shielding in the cable when the shielding is grounded to the vehicle. Maybe the body or something cut into the insulation, lots of sharp edges under the dash and fender.
 
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