Antenna? Brown is ground, look to see if there are any wires going to a nut/screw anywhere...someone might have replaced the bad ground with a new one to the body.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth