I don't watch or record NFL games with the Ceton unless they are cable network specific. I know not everybody has the luxury but I too have a couple of HD Homeruns which complement the Ceton perfecctly.
Local OTA broadcasts are often superior to the Comcast delivered version of same. Not only will OTA often look better, sometimes lots better. It is just a a selection in the guide and if I want something even better it is only couple of remote clicks away from WMC to J River Media Center.
With OTA I can use J River Media Center which give me madVR rendering which can be vastly better than WMC live TV. In many cases the difference between the cable delivered version in WMC and OTA through JR MC and madVR is night and day. I watched 3 games yesterday including the Sunday night game and the Ceton and WMC was never involved. Of course the Monday night game is an ESPN affair and the Ceton and WMC will deliver it. Even then I will compare the HP Media Smart Windows Media Center Extender to WMC direct and that almost alway provides a better rendering then WMC.
Complicated, yes but on a big screen you go for the best sources and rendering where you can especially on 3 plus hour or even all day affair like football on a Sunday.
Mits WD-92840 92" DLP - Lumagen Radiance XS, Martin Logan Motion 40s, Ascend Sierra 2s
Older 58" Panny Plasma -DVDO DUO, JBL Studio 530
Pioneer AJs, PSB Images, Usher S520, JBL HLS-610, Definitive SM45, MusicHall Marimba