Patent ID: 8497776

Claim:
A radio frequency identification (RFID) system used to perform electronic article surveillance, the RFID system comprising: a gate; a first RFID reader antenna affixed to a first post of the gate; a second RFID reader antenna affixed to a second post of the gate and wherein the first and the second RFID reader antennas are facing one another and each pointing to an inside of the gate; a third RFID reader antenna affixed to the first post of the gate, opposite the first RFID reader antenna; a fourth RFID antenna affixed to the second post of the gate and opposite the second RFID reader antenna, wherein the third and the fourth RFID reader antennas each pointing outward with respect to the gate, and wherein signal strength differences between the first, second, third, and fourth RFID reader antennas are used to assess a likelihood of a possible theft of an item.