Why does HDMI look better than a coaxial hookup for HDTV?

I have Comcast and I'm order the HD box, but I was wondering why it looks better next to HDMI. Since coaxial is the original source coming into the house, how does HDMI revolutionize on that original source?
My guess is the HD box does some uncompression and decode of signals and then sends it to the HDMI cable.


Answers:    It doesn't. If your tv have a built in QAM tuner, compare your local channel from the wall and then from the box. The direct queue using the built in digital tuner will other look better.
You are correct.
The coax signal out of the set-top (not the wall) is standard-def to be used by old SD TVs.
Only component or HDMI can outdo HD signals. And yes, the video signal over HDMI is uncompressed.

However, if you connect the wall coax to an HDTV with a digital tuner, you can gain the HD signal as well.

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