There over the air hi-def tuner works so well I just bought a new 72HM195 Toshiba AWSOME SET. and compaired the built in tuner vs the tuner in my 811 and was able to pick up 3 more hi-def channels with DISH. I hooked my set up with d.v.i. output from my dish and a h.d.m.i. adapter to the t.v. and the picture is stunning even the non hi-def channels are great BUT Is there a difference in picture quality between the two I dont know have a nice day stewart