How do you repair or replace the power antenna on a 1998 Oldsmobile Regency?

To repair or replace the power antenna on a 1998 Oldsmobile Regency, first, disconnect the negative battery terminal to ensure safety. Remove the interior trim panel where the antenna is located, then unscrew and detach the old antenna from the vehicle. If replacing, install the new antenna by securing it in place, reconnecting the electrical harness, and reassembling the trim panel. Finally, reconnect the battery and test the antenna operation.