Superbowl 2009 on NBC - is it going to have the black bars around the picture or is it going to fill up my 46"?

It depends on what your source is. Obviously your TV is an HDTV, as long as you are watching it straight off the air (antenna) it will be in HD and fill up the screen. If you have HD cable or satellite, then it will fill up the screen. If you have satellite or cable that is NOT HD, then it will not fill up the screen. Even with HD, some commercials will still be in standard definition and the bars will appear, but during the Super Bowl with commercials costing 1 million dollars per second....pretty safe to say most of the commercials will fill in your screen too.

yes I think it going to have the black bars around the picture

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Depends on if you have an HD box. If you do, you shouldnt have a problem....i imagine all things Super Bowl will be in HD Sunday

it should fill it up, i have two big screen tv's and when i watch NFL games on them they fill it up.(sometimes on commercials and stuff its not wide screen and has the black bars) but always during games its full