Like Bill, I don't have any experience with the setup you are asking about, but what does comes to my mind is the actual weight of the King Dome. If it is very heavy, I would think that could interfere with the ease of opening of the shell.
Just passing along my initial thoughts. I looked it up and it appears to be 35lbs. I don't have the specs for the OE Winegard antenna. It may turn out that the King Dome is lighter than the batwing antenna you now have. I am sure you will get some great advice here on the forums from ones who are a lot smarter than me (or is the correct grammar "myself").