OK, so the question is now...how do I connect a SAT Receiver to the 5 wire (Component video + Audio) feed into the Tiffin...
https://en.m.wikipedia.org/wiki/Component_video
Component AV was the predecessor to HDMI...but not totally equal.
The simplist way to do this is to acquire a Dish ViP-211k (only the "K", not the "Z" or "W"ally) which has the Component (5 wire) Output. The 211k is still sold but is not current model line-up. We have the 211k and it works perfectly.
Or...You can connect any receiver using the receiver's "Composite AV" (3 wire) output with an adapter like:
https://www.amazon.com/Component-Com.../dp/B003FJKHBU
Or...convert the SAT HDMI output to Component AV with an adapter like:
https://www.amazon.com/Portta-PETRHP.../dp/B003VJ9RP6
I believe that most new SAT receivers have moved away from the old 5 wire output in favor of the HDMI port.
Best luck