RFID Journal Staff asked 11 years ago What type of tag would I need to use in order to locate an item below the surface using an RFID reader 20 feet away?
—Name withheld
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Unfortunately, there is no RFID tag that can be used underwater to detect an object located 20 feet away. Passive low-frequency (LF) and high-frequency (HF) tags can be read underwater, but only from a distance of about 3 feet or less. Passive ultrahigh-frequency (UHF) tags have a longer read range, but UHF energy is absorbed by water, making it impossible to achieve such a long read range underwater. Sorry.
—Mark Roberti, Founder and Editor, RFID Journal
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