Windows has Known issues with broadcast tv reception combine that with a tuner stick and the issues get worse.
Also Tivo tuners have Known issues with broadcast Tv reception.
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Tv's have the best tuners for broadcast reception.
And here are Tuner/Recorders that are Very Good at Broadcast Tv Reception and Very Good Useability.
http://www.epvision.com.
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Channel Master has Tuner/Recorders.
http://www.channelmasterstore.com.