How do you repair or replace the power antenna on a 1991 Cadillac Brougham?

To repair or replace the power antenna on a 1991 Cadillac Brougham, first, remove the interior panel near the antenna to access the mounting screws. Disconnect the antenna wiring and unscrew the old antenna from its base. If replacing, install the new antenna by securing it in place, reconnecting the wiring, and reattaching the interior panel. Test the antenna to ensure it extends and retracts properly.