ok, i have comcast hdtv now, and even though the hdtv channels look good the rest of the channels look like crap. if i got dish would the picture look better overall (hdtv, and digital). how does the hdtv ota channels mesh with the rest of the channels..is it a seamless transition?. also does the dishnetwork package include a ota antenna? if i get dishnetwork...is there a trial peroid before i get stuck in a year contract?