Different providers will give different answers. I don't know how comcast does it, but I know that around here you can hook regular televisions up to a digital signal line without the box and get the regular analog signal. For satellite every television you want to have connected has to have a box, but you should have the option to choose between a regular and HD box when you order.
As far as I know, only some of the channels in your HD package will actually be high definition, with the rest being at the standard resolution anyway.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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