The term "power antenna" can refer to a device to amplify the signal or a
motorized device that can be controlled to raise or retract the antenna. The
former may be found from such firms as "Crutchfield", the latter may be
found from say "Amazon", ranging from $14.00 to $60.00. Can't vouch for
long term functionality of these units, but might be fun trying them out!
You could try the JY for a unit from a Caddy or Chrysler, assuming they
don't have antennas built into the windshield.
If going for a motorized unit, be sure there is sufficient room in the
under fender area to accommodate the girth and length of the unit.
Hope this helps,