A pneumatic tyre equipped with a radiofrequency transponder and comprising a crown, two sidewalls and two beads that rotate about a reference axis, first wires forming outward and return segments, arranged in an adjacent manner, aligned circumferentially, anchored in the two beads with, at each bead, loops that each time link an outward segment to a return segment and, in each bead, means for anchoring the first wires comprising second circumferentially oriented wires axially bordering the first wires and forming at least one spiral, the first wires forming at least one circumferential alignment defining the carcass ply that separates said pneumatic tyre into two areas, an inner area and an outer area, relative to said carcass ply, and the radiofrequency transponder comprising at least anelectronic chip and a radiating radiocommunication antenna and being arranged radially externally relative to the at least one spiral, characterized in that the radiofrequency transponder comprises aprimary antenna electrically connected to the electronic chip, in that the primary antenna is electromagnetically coupled to the radiating antenna and in that the radiating antenna consists of a single-strand coil spring defining a first longitudinal axis.