good idea. all you need to do to remove it is un-do the set screw in the crank, and then go up on the roof, and drill out all the rivets holding it on.
then, observe the corroded roof skin, and the pinholes in the base plate of the skyliner, where all the water has been coming in.
My crank wouldn't come off, so I had to cut it. Once I got the antenna out, I found that the innards are so rusted up and frozen, they'd never work again. These parts aren't available anywhere that I could find. The raise/lower gears, yes, but nothing else.
So, I wired out the corrosion on the skin, cut an aluminum patch, and covered up the hole.
Replaced the antenna w/ a modern "Bat Wing"...but it won't fit where the skyliner was, so I had to drill new holes in the roof, placing the antenna mount sort of along side the forward vent. Otherwise, the head would hit the a/c shroud.