I just purchased a Keystone Residence 401MBNK, it is a 2018 model. I have been trying to set up OTA TV and I understand that I have a Winegard Antenna on the roof. What I have seen is a "Flying Saucer" like disk on a short stalk. It is not flat but bulges out on the top and the bottom. It appears to be mounted to the main roof right near the refrigerator push out. My understanding is that these arean amplified omnidirectional antenna. I tried hooking up a cable from the cable panel by the entertainment system to the tv and it finds no channels and according the antenna pointing apps I should get 9-10 strong channels. When I ask AI is says there should be a plate with a blue light and an on/off button but I cannot find it anywhere. I have an antenna input on the back of the trailer right above a tail light but there is not panel anywhere outside with an amplifier or cabling, etc. Before I spend money to buy a new antenna to hook up to the antenna input (and I am not sure that would even work) I am hoping to get some info on what I need to do to get the built in Winegard working. TIA