It is a Mitsu WS-65809 HD 1080 Series about 5 years old.
It has Ant A, Ant B (both threaded), Input 1,2,3 (all for RCA type or S-video) and Component 1,2 and DTV. Only one labeled 1080i is the DTV component set. So it appears there is only ONE input set that will support 1080i. I just...