A closure includes a plastic shell for securement to a container neck finish. An RFID kernel tag is disposed within the shell, and includes an RFID circuit and a low power UHF antenna coupled to the circuit. A boost antenna, electromagnetically coupled to but otherwise disconnected from the RFID kernel tag, boosts signal gain to and from the RFID kernel tag. In several exemplary embodiments of the disclosure, the RFID kernel tag is secured to an undersurface of the base wall of the closure, and the boost antenna is disposed on the undersurface of the closure base wall, on an opposing surface of a liner disk disposed within the closure shell or comprises a metal layer on an induction seal disk secured to the end of the container neck finish.
