On my 2016 371REBH, there is a second cable in the cabinet with the TV that is not connected, you might have to fish around for it, but mine has one in there. I even think mine might have a tag on it that says satellite, think it is grey colored.
2016 F350 4X4 CCDually Lariat with 6.7L and 3.73 gears
2016 Sierra 371 REBH
2015 Xpress H20PFC w/ Yamaha SHO 150
Days Camped: 2013-8 2014-16 2015-38 2016-86 2017-64, 2018-6 and counting