Trouble Diagnoses: Inspection: Antenna

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Using a jumper wire, clip an auxiliary ground between antenna and body.

If reception improves, check antenna ground (at body surface).
If reception does not improve, check main feeder cable for short circuit or open circuit.