DTV and Dish Network both look like crap in my honest opinion due to the compression rate mentioned by rlj5242 DTV will be less so when the local spot sat is stationed and online (may be allready)If you want supirior video use a large c/ku and 4d satellite dish (the big one) if you have the space and the money .
Or an off air for network . the last two should and will give you a far better picture than DTV or Dish Net .
Digital channels are another thread.