Buick 1994 LeSabre Owner's Manual page 148

NOTICE:
If the mast portion of your antenna is damaged, you can
easily replace it. See your dealer for a replacement kit
and follow the instructions in the kit.
Don't lubricate the power antenna. Lubrication
could damage it.
NOTICE:
Before entering an automatic car wash, turn off
your radio to make the power antenna go down.
This will prevent the mast from possibly getting
damaged. If the antenna does not go down when
you turn the radio off, it may be damaged or need
to be cleaned. In either case, lower the antenna
by hand by carefully pressing the antenna down.
146