Here's what you need to know: HDTV receivers have built-in digital tuners. That means that if your local station is broadcasting in high definition then you can attach an indoor or outdoor antenna to an HDTV set and watch in high definition.
An HDTV-ready set does not have a built-in tuner. HDTV-ready sets usually have analog tuners, so you can still watch current analog TV broadcasts. They can, however accept an HDTV input.
So, with an HDTV-ready set you’ll need an external digital tuner to watch HDTV programming. However, if you have high-definition cable or satellite service you can watch those HDTV stations right now on your HDTV-ready set, no extra tuner needed.
Most of the TV sets being sold today — especially those nifty flat-screen models — are at a minimum — HDTV-ready.
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