deploying at each transition between separate areas of a facility a plurality of RFID reader antennas, each antenna deployed at a given transition covering a span of the given transition from a different perspective such that each point in the span is covered by at least two antennas;

detecting, by the antennas of a first transition between a first area and a second area of the separate areas, and in combination with an RFID system in communication with the antennas of the first transition, a tag known to have been in the first area, and identifying an item associated with the detected tag as moving to the second area; and

subsequently detecting, by the antennas of a particular transition of the second area, and in combination with the RFID system in communication therewith, the tag, and identifying the detected item as leaving the second area for an area across the particular transition.