Abstract: An annular antenna and transponder are affixed to a tire using the transponder as a counterweight to offset tire imbalance. The annular antenna is attached to an inner tire surface and is coupled electrically to a transponder device and is fixed relative to a housing in which the transponder device is packaged. The mass of the transponder housing is used specifically to counterbalance tire imbalance by first ascertaining the position at which a counterbalance would prove to be beneficial and then affixing the annular assembly to the tire so as to position the mass of the transponder housing at the optimal location for counterbalancing benefit.