Section 107 (Entertainment): Antenna: Inspection
WARNING: This page is about a different car, the 2003 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Measure the resistance between antenna terminal and each antenna wire.
If an antenna wire is OK, resistance will be less than 1 ohm. If an antenna wire is broken, the resistance will be more than 1 M ohm.
NOTE:
When checking the continuity, wind a piece of tin foil around the tip of tester probe and press foil against wire with your finger.
To locate the broken point, move the probe along antenna wire.