One thing to beware of is that noise, ghosting, and the like can prevent a DTV box from tuning a strong enough signal, so a strong noisy preamp (some are better than others) with a mediocre antenna can be worse than a good antenna with no amp...
Another option, if you are adventurous, is to drive through an older neighborhood and look for a good specimen on the roof of a home that clearly has cable or satellite, and offer to remove the 'ugly' antenna from their roof for free on the condition that you are allowed to keep the antenna. Some of the classic TV antennas were worlds better than anything made now.
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