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My company (I'm a partner) is an RFID solution provider, mostly the 13.56Mhz.
Most RFID tags are passive so you need a good size antenna to get much range. The handheld readers we use only read the tags when they are almost touching - 1/2" or so.
We're also working on solutions the use "active" tags for tracking people (inmates) and objects. Active tags have a battery and send out a signal that can be picked up across a room. Think car toll xmitters.
One advantage to RFID is the increased data storage and resistance to counterfeiting.
-Chris
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