I understand that you want to know if the Slingbox PRO will work with the Direct TV receiver.
The Slingbox (any model) was not designed to work with a direct connection to your TV set. They will work with the basic cable service (Slingbox Classic and Slingbox PRO) or a set top box (Slingbox PRO, Slingbox SOLO and Slingbox PRO HD)
You only need to feed the set top box with the cable that comes from the wall and then connect the set top box to the Slingbox. This way, you will be able to get all the channels on your Slingbox.