A substantially cylindrical metal container (1) having an outer surface (2), an upper end and a lower end (3) and having a cavity formed by a circular and concave parabolic bottom (4) and a circular rim (5).An UHF band RFID tag (6) having an integrated circuit (7) and an antenna (8) is disposed at the lower end, and the antenna is positioned above a predetermined distance from the center of the bottom (4) so as to reflect the antenna radiation.
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