An RFID tag system which communicates with a base station at a predetermined frequency for a container having a metal closure comprising an insulator mounted to an exterior surface of the metal closure and a radio transceiver system coupled to the insulator. The radio transceiver system further comprises an antenna tuned to the predetermined frequency mounted to an exterior surface of the metal closure and an RFID IC chip coupled to the antenna and coupled to the metal closure. In a first embodiment, the RFID IC chip is mounted outside the metal closure. In a second embodiment, the RFID IC chip is mounted within the metal closure and connected to the antenna outside the metal closure through an electrical feedthrough connection in the metal closure.