HD radio and old antennas


Does anyone know if old AM/FM antennas (like the ones made by Terk) will still work with HD radio? Some of Terk's products are listed as "digital ready" (not the ones I own) but I don't see any reason why the antenna technology would change.
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This does bring up the big problem that some people were predicting with HD FM - the effective reception range of the digital broadcast will be quite short.
This is the most promising FM antenna I have seen,
http://www.seengineer.com/

Note that it mounts on the eaves of your home like DBS, which is much more convenient than the Yagi roof mounted antennas. They emphasize precise impedance matching and high S/N ratio.