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No passive UHF RFID system would enable tags to be read from 50 meters in the air. A low-cost passive UHF RFID system has a range of up to 10 meters (33 feet). It might be possible to read tags 2 to 3 meters underground, but it would depend on soil conditions. Dry, loose, sandy soil might allow enough RF energy to reach a tag that it could power up and reflect back a signal to a reader. Water absorbs RF energy in the UHF spectrum, however, so it is highly unlikely that dense, moist soil would allow enough energy to reach the tag—or, if it did, for the energy from the tag to reach the reader.
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