1. A method of transferring power or data or signals through a plurality of electrical resonators that support waves of inter-element excitation comprising waves of current induced in each resonator or magnetoinductive waves, MIWs, to wirelessly transmit power or data or signals to a receiver located adjacent to one or more target resonators of the plurality of electrical resonators, the method comprising locating the target resonator or resonators by determining which electrical resonator or resonators have the best coupling to a target device comprising the receiver placed in proximity to the plurality of electrical resonators; wherein the method comprises placing a first sub-set of the plurality of electrical resonators in an ‘off’ state and a second sub-set of the plurality of electrical resonators in an ‘on’ state, and determining that the target resonator or resonators are located closest to a resonator in the first sub-set of electrical resonators if the target device is receiving power from the plurality of electrical resonators.