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There's both digital and analog broadcasts out there. All your big networks will be digital. As for HD, you'll find channels, especially subchannels sometimes are not HD. And subchannels, take say, your old channel 9, it's now 9.1 for the main and 9.2, 9.3, etc for subchannels. And don't get confused by "HD" marketing. An old 1982 rooftop antenna would work fine today. There's no requirement for an antenna to be HD compatible.
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