If you live in Calgary the ATSC tuner won't do you any good until Calgary gets it's own Digital TV stations. Hopefully this happens fairly soon but in the meantime you'll need a cable or satellite HD source. Even when these stations come on line you'll still need a box or receiver for TSN HD or other specialty channels.
In my experience it only make a difference in HD shows. In fact some HD TVs have a harder time giving a good picture when watching ordinary TV. The flaws in the poorer picture may show more. Sorry if this sounds confusing, I'd go looking at a lot of TVs and do some reading.
BE aware some of the TVs you look at have their brightness and contrast turned way up so they stand out [torch mode] or they don't have a good signal feed. Go to a few stores. If you're married take your wife with you so that you both like the picture.
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