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Most of the ATSC set top boxes I've seen simply generate a letterbox 4:3 picture when presented with a 1080 program.
A couple of non coupon boxes present a full screen anamorphic picture, but unless the tv is capable of a 16:9 mode by dropping the vertical height, the result isn't very viewable.
My Sony PVM 2950 accomodates this mode quite nicely when I use a samsung HD STB.
The 4:3 programming on stations that transmit in 1080i means issues with aspect ratio -you get a small square picture about 14" on a 29" crt.
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