Intensities of electric and magnetic field components of an electromagnetic field are measured by measuring conductors and a reference conductor in the electromagnetic field. The measuring and reference conductors simultaneously derive plural output currents that are measured in different directions relative to the electromagnetic field. The magnitudes of the measuring conductor output currents and phase differences between the measuring conductor output currents and the reference conductor output current cause calculation of an electric field component current generated in the measuring conductor by an electric field included in each output current and a magnetic field component current generated in the measuring conductor by a magnetic field included in each output current. Based on the magnitudes of the calculated electric and magnetic field component currents, the electric and magnetic field intensities are determined.