After a long delay, here is the power antenna info:

Metra “Road Works” Universal Power Antenna AW-PW22. Available from Murray’s Discount Auto, AutoZone, and other retailers.

11 ½” under fender clearance
31” 5 segment replaceable mast
5A draw on extension/retraction
Two wire hookup (red, battery constant; blue, switched to trigger up/down) plus chassis ground bracket.
Comes with adapters/grommets for 6 different mounting angles.

It looks fairly close to original from above, if you didn't know what the original looked like you'd probably not know it was aftermarket.