The answer depends on the type of RFID solution that you are using. Passive low-frequency (LF) and high-frequency (HF) systems have a read range of approximately 3 feet (1 meter). A passive ultrahigh-frequency (UHF) system has a read range of 10 feet to 25 feet (3 meters to 8 meters) under most conditions, but phased array antennas can read tags from a distance of 100 feet to 600 feet (30 meters to 180 meters) or more. Active RFID systems, on the other hand, can typically be read from 300 feet (90 meters) away, but many can now go up to 1,500 feet (460 meters) or more by employing signal repeaters.
—Mark Roberti, Founder and Editor, RFID Journal
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