Also, go to the Thor Motorcoach website and go to the Owners section at the attached link.
https://www.thormotorcoach.com/owners/
Sign up for an account. It will ask for your Thor model, year, and VIN. When you sign into your account you should be able to download productions drawings and also access operation manuals for all the second party appliances and equipment installed on your coach. There should be a Winegard operation manual among the items listed for your RV.