Hi DougandRobin,
The AVI and HDMI connectors should go to TV inputs so you can hook up a satellite dish or DVD/BluRay player or other equipment with AVI or HDMI outputs.
One of the two connectors on the dual coax plate is likely for the wiring from the Cable TV and rooftop antenna conections. The other is likely the satellite connection. The other ends of the cable TV and satellite coax will be found in your Universal Docking Center (UDC).
The single coax plate may be wiring an outside TV so you can send cable or antenna signals there.
Take a look at pages 44-48 of our owner-written
Landmark 365 User Guide. Your 2014 apparently didn't come with the splitter as shown for the Landmark 365, but the rest of the setup is probably either the same or very similar.