A high voltage electric power line monitor includes a current sensor, a voltage sensor, an energy harvesting power supply, and a communication device. The monitor is supported by an overhead power line support structure, such an insulator housing a sectionalizing switch. The current sensor coil and the energy harvesting coils are positioned transverse to the power line with the power lane passing through the coils. A foil patch voltage sensor and a communications antenna are carried on an electronics board positioned parallel to the monitored power line, typically below the current sensor. Both the current sensor and the voltage sensor are positioned adjacent to, but spaced apart from, the monitored power line creating an air gap between the monitor and the power line. The sensors are housed within a Faraday cage to shield the current sensor from electromagnetic contamination.