Replacing the Winegard Sensar with a King Jack antenna

The "big hole" isn't that big to install a Sensar. I think it's a 1" or 1 1/4" hole that allows the shaft to come inside the coach with room to get a tool up there to tighten the inside nut. You will be able to connect the Sensar to your current incoming coax and install the power supply in that existing line. You just need to be careful that you lay everything out of the roof to ensure clearance for the Batwing plus the 90 degree UHF offset antenna.