hdtv high definition ntsc antenna

Hi Folks:
Here at work, our antenna-driven NTSC TV is starting to lose
quality. At my house where I have HD TV, I get great pictures on a 6"
piece of wire, on UHF. I'm beginning to think that the high-
definition transmissions are on the same frequencies as NTSC! Is this
the case? Could this be why we're losing NTSC quality?
Thanks!
Harry

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