Section 61 (Entertainment): Antenna: Inspection
WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
Measure the resistance between the antenna terminal and each antenna wire.
If an antenna wire is OK, resistance will be less than 1 Ω If an antenna wire is broken, resistance will be more than 1 MΩ
NOTE:
When checking the continuity, wind a piece of aluminum foil around the tip of tester probe and press foil against the antenna wire with your finger.
To locate the broken point, move the probe along antenna wire.