jm is correct, the timer method is the best way to insure that MOST of the
HD programs get on properly, along with local commercials inserted.
In FOX's case, they provide a full time 16:9 feed, so we don't have to bother with programming a timer. It's not that way for other networks.
The views expressed here are my own and do not necessarily represent those of ABC, CBS, CW, FOX, MeTv, or AntennaTv; my employer; or its parent company.
Nor my wife for that matter!