Other issues could be in the way the network has setup the feeds off the satellites for HD. I know for CBS, the operator has to actively change feeds to pick up the right HD broadcast, particularly on the weekends with sports moving around during the day. FOX is much more automated, the network changes the feed for you, and FOX only has something like two HD network feeds available for the entire network distribution across the nation. So often the network is changing what is being broadcast on that particular feed, and the local has little choice but to take what they are given. A bit maddening during NFL, if you want Dallas, but are only getting Denver.. CBS will often allow the local affiliate choose what games they will pick up that weekend and it's up to the affiliate to get the right HD feed off the satellite to match their SD side. Fox's system advantage is simplicity and allows for all FOX affiliates to get HD passed onto viewers no matter how small the market size may be, or local stations budget for HD conversion. FOX practically hands it to you ready made; you just need to get it to the transmitter. CBS, NBC, ABC require a lot more investment from the local to make HD work.