Analog broadcast television is never as good as DVD quality. Period. At best, there's less effective pixel resolution (most of the time... analog vs. digital can be a little apples vs. oranges), much less color resolution, and relatively poor audio as well. And that's before you factor in any noise you might get... particularly with over-the-air video.
You won't get the full quality of the DVD unless you're using a good television with component inputs.
Digital broadcast these days, however, can be as good or sigificantly better than DVD. High definition broadcast will be a bit lower quality than is possible on Blu-Ray, but it can be substantially better than DVD. It's technically possible for broadcast stations to broadcast in full 480i or 480p digital, which can precisely match the specs of DVD. However, most of the 480i/p broadcasts these days are "secondary" subchannels... they'll send out one HD channels and a couple of lower quality SD subchannels.
Digital satellite and cable can also achieve DVD quality in standard definition and better-than-DVD in HD. But they don't always do that. Particularly on satellite TV, the channel slots are at a premium, since launching new satellites is very expensive. So they use more compression, as a rule, than you would see over cable or OTA.
It's possible. If you're watching TV at 480i, and you're watching a DVD on a progressive DVD player, then obvious, the DVD will be better than the TV show (480p vs. 480i).
Normally it depends on the T.V you have but the DVD could be really high quality and the T.V show low quality and vice versa.
really there's no definite answer.
Have you tried watching a true HD program on TV? I think you will find it to be much better quality than a DVD.
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