How do you replace power antenna on 1985 Buick Riviera?

To replace the power antenna on a 1985 Buick Riviera, first, disconnect the negative battery cable to prevent any electrical issues. Remove the interior trim panel or cover to access the antenna mechanism, then unscrew and disconnect the old antenna from the wiring harness. Install the new antenna by reversing the removal steps, ensuring all connections are secure, and finally, reattach the trim panel before reconnecting the battery. Test the new antenna to ensure it operates correctly.