If you don't mind my asking, how much and what kind of outputs does it have?
I have an 811 in storage and a 622 and 942 currently hooked up. I really only have 2 OTA digital stations and they both lock on all 3 receivers.
However there are a few fringe stations that used to register mid 50s / low 60s with the 811. I even got a brief lock on them a couple of times but with the 622 and 942 you wouldn't even know those stations existed.
Of course everyone here knows my opinion - that Dish doesn't really want you getting digital OTA anyway - especially in areas where they have HD LiLs. Most OTA HD blows Dish away for PQ.
I'm betting the more HD LiLs Dish launches, the more problems you're going to see with their OTA tuners. Either that or they will incorporate a separate OTA HD "enabling" fee.