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I bought a hitachi plasma 42 inch hdtv and just bought a hd box from suddenlink, but even after connecting everything the way it should be the channels that should broadcast in hd still look pretty bad. Do i need some type of antenna or something? Any help would be much appreciated.

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My standard dvd player shows an amazing picture on my HDTV. I am getting an HD receiver next week and just wondering if the picture will be getting any sharper. I am told it will, but how is possible for the eyes to see anything sharper than a dvd?
For you people watching HDTV…Do you really see a difference between HDTV (HD source) and watching a regular DVD?