A system for wireless power transfer comprising: a transmitter comprising: a transmit resonator configured to couple power from a power source into an oscillating field generated with a reference phase by the transmit resonator resonating at an oscillation frequency, the oscillating field being at least one of an oscillating electric field or an oscillating magnetic field; one or more repeaters, each at a respective location, and each comprising: a repeat resonator configured to resonate at the oscillation frequency in response to coupling to the oscillating field at the respective location, and a phase adjustment element, wherein each of the one or more repeaters is configured to, in response to the coupling resonator resonating at the oscillation frequency, specify a respective phase shift of the reference phase relative to a phase of the oscillating field at the respective location and, using the phase adjustment element, regenerate the oscillating field with the specified phase shift at the respective location, and wherein the oscillating field at the respective location is at least one of: the oscillating field generated by the transmit resonator or the oscillating field regenerated by a different repeater of the one or more repeaters; and at least one receiver, the at least one receiver including: a receive resonator configured to resonate at the oscillation frequency in response to coupling to the oscillating field, wherein the at least one receiver is configured to, in response to the receive resonator resonating at the oscillation frequency, transfer at least a portion of power of the oscillating field to a load associated with the at least one receiver. a transmitter comprising: a transmit resonator configured to couple power from a power source into an oscillating field generated with a reference phase by the transmit resonator resonating at an oscillation frequency, the oscillating field being at least one of an oscillating electric field or an oscillating magnetic field; one or more repeaters, each at a respective location, and each comprising: a repeat resonator configured to resonate at the oscillation frequency in response to coupling to the oscillating field at the respective location, and a phase adjustment element, wherein each of the one or more repeaters is configured to, in response to the coupling resonator resonating at the oscillation frequency, specify a respective phase shift of the reference phase relative to a phase of the oscillating field at the respective location and, using the phase adjustment element, regenerate the oscillating field with the specified phase shift at the respective location, and wherein the oscillating field at the respective location is at least one of: the oscillating field generated by the transmit resonator or the oscillating field regenerated by a different repeater of the one or more repeaters; and a repeat resonator configured to resonate at the oscillation frequency in response to coupling to the oscillating field at the respective location, and a phase adjustment element, wherein each of the one or more repeaters is configured to, in response to the coupling resonator resonating at the oscillation frequency, specify a respective phase shift of the reference phase relative to a phase of the oscillating field at the respective location and, using the phase adjustment element, regenerate the oscillating field with the specified phase shift at the respective location, and wherein the oscillating field at the respective location is at least one of: the oscillating field generated by the transmit resonator or the oscillating field regenerated by a different repeater of the one or more repeaters; and at least one receiver, the at least one receiver including: a receive resonator configured to resonate at the oscillation frequency in response to coupling to the oscillating field, wherein the at least one receiver is configured to, in response to the receive resonator resonating at the oscillation frequency, transfer at least a portion of power of the oscillating field to a load associated with the at least one receiver. a receive resonator configured to resonate at the oscillation frequency in response to coupling to the oscillating field, wherein the at least one receiver is configured to, in response to the receive resonator resonating at the oscillation frequency, transfer at least a portion of power of the oscillating field to a load associated with the at least one receiver.