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Everything I've read indicates that the 2009 date is a cutoff for NTSC only, not SDTV. Considering HDTV is only a subset of the new ATSC standard, I see no reason stations couldn't continue to broadcast SDTV. But, in the interest of maintaining or gaining viewers, and the fact that stations have had to upgrade anyway, my guess is most will broadcast an HD signal, even if much is upconverted from SDTV. That's certainly the case with our local stations, and while there is considerably more HD content now, there is still a lot of SDTV programs; particularly reruns of older shows (I don't know if they upconvert though).
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