The Winegard replacement version has a bracket that installs on the Winegard mount:
Otherwise everything still works like the Winegard version. The nice thing tho is you simply replace the old antenna by removing a couple of shafts and E-Clips and that's it.
It's literally a 10 minute installation. And since they don't cost much, they are an easy fix. I think I paid around $45 for mine. But I ended up having to replace the coax, so the 10 minute job ended up taking a couple of hours.
I was able to use the existing Winegard 12V power adapter, so I didn't have to replace or rewire that.
One other thing I had to do though is to put a 45deg coax adapter on the Jack antenna as the orientation of the antenna output connector resulted in the coax rubbing on the roof when the antenna was lowered.