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Hi--my results are totally location-specific but here it goes:
In my garage where I work on things I set up a DTT990 box with two antennae. I have a 300 ohm dipole in the attic of the structure with a 300-ohm loop in parallel...the UHF loop sits on the ground, literally, in soil with a long line of twin-lead going to the combiner box(Heath brand)...between the two I can pick up the entire NYC digital televison spectra; both UHF and VHF, and after much testing, I've found that the signal drops off sharply If I run only one antenna at once.
Whacky? yes. But it does work!
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