does anyone know where to get a stock power antenna for a 80 cutlass or just the mast< thanks chris

 

The mast can be had at the local GM dealer - it was used on a slew of cars. However, be prepared to pay 50 bucks+ for it. I have the part number somewhere.
You have to drill out the rivets and use bolts to reassemble.

Other options would be to get one at a bone yard. Many of the antennas were similar - just the top mount and bracketry changed to fit different years and models.
When browsing the yard, look for antennas on 1980-1999 GMs that are retracted, with their top *****, and in a similar location (front fender).
Look at them through door openings if possible to help match them to yours.
Take your top screw-on bezel and remove the one on the donor car and see if the thread match.
Taking a small battery to hotwire it can help, but must yards guarantee them.