Just recently purchased a 2016 2401W.
In the cabinet above the door, left sidewall where the TV plugs in, behind the power/amplifier plate is another plate with 3 coax connectors, there is a coax cable between the top and bottom connectors.
What are the 3 connectors and why the strap between top and bottom?
It's from Brian Clemens (still the best!) and explains that the center connector is pre-wired for a rooftop satellite dish. I think this arrangement allows you to insert a satellite receiver into the mix, connecting one of the other two coax's to a cable or antenna in on the receiver, connecting the center connector to the satellite in, and connecting the third connector to a TV out on the receiver.