The connection is under the blue ray player "box". You will need to take the blue ray player out, take the box out, three screws, two on lower left and one upper right. There you will find an array of wires and a small box, it's a slitter box. Then as rbs says you need to get an HDMI switch box. Connections are fairly straight forward and box is switch box is labeled input and output. In would be the "free" coax which is the Sat connection and out would be a new HDMI cable you buy. I also on several AS hooked up the Blue Ray into the switch box so I can switch back and forth. The TVs thru the antenna operate off a different wiring schematic.
Hope this gets you on track, I am doing this without looking at what I've done three times now and I am pretty sure I've got it all in.
Bud & Alice (Bud posts)
Abby- Black Lab-TDI Certified
Hopey-Yellow Lab-TDI Certified
2017 30' Classic
2015 F350 6.7 Diesel Crew Cab
USAF - Military Training Instructor (TI) - 68-72