Native HDTV (1080i & 720p) is 16:9, but if your local DTV stations choose to upconvert non-HD programming (which most will do), then the upconverted programming AR will be 4:3. Some FOX stations also will stretch the 4:3 to 14:9 and may or may not upconvert from 480p to 720p.
On Showtime HDTV they use the original AR of the movie.
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