this is the info I got from sears website... you can type in HDTV and pull up any tv and click on buyers guide... most of the info you need should be there. HDTV HDTV stands for high-definition television. A true HDTV includes a built-in NTSC tuner, ATSC tuner, 16:9 aspect ratio and the ability to display at least 720-line resolution images. High-definition television delivers true-to-life images, taking your entertainment experience up a notch. What differentiates a HDTV from a HD-ready TV is having the ATSC tuner already built in. HD-ready TVs have a NTSC tuner, but require connection to an additional ATSC tuner. It is common to see a TV described as being a HDTV, but it may be only HD-ready because the ATSC tuner is not built in. Confirm the status of the ATSC tuner before purchasing a HDTV. • HDTVs allow you to receive over-the-air high-definition and standard broadcasts without an additional set-top box (HD-capable antenna required) • HD-ready TVs are fully capable of a high-definition display when connected to an optional HDTV source, such as an ATSC tuner