Replacing the Winegard Sensar with a King Jack antenna

Based on the evidence, our experience with poor performance with our Jack and the fact that we usually boondock and usually pretty far out, I've decided I want to replace the King with a Sensar.


Unfortunately I haven't seen any walkthroughs or youtube videos. Do any of you know how much of a pain this replacement is going to be? Do I have to drill all new holes(except for the big one)?