I replaced my batwing with a "King Jack" about 4 years ago. Tripled the # of channel I receive at any given campground. I got the one that's made as a
replacement unit. It took longer to get out the tools & ladder and climb up on the roof than it did to do the actual replacement.
If your mounting posts weren't damaged, you can use this one too. Otherwise, you'll have to get the one that comes with the shaft.
Hope this helps! b