There are three things you need to watch HDTV.
1. An HD source
This can be a. a satelitte receiver b. a cable box or c. an 'over the air' signal. For 'c' you need a Digital tuner and an antennae. Some TVs come with this tuner and my satellite receiver has one. Calgary should be nest in line after Ottawa to get a CBC digital station. d. a HD DVD or game box can be another source. e. your computer
2.HD cabling such as HDMI, DVI or Component between your TV and your receiver. If your TV has a HD tuner and an OTA source, you may not need this cabling
3. An HDTV
If any of these things are lacking, you won't have true HD.
I may have missed something, but you get the idea.
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