The microwave radio direction finding system includes two six-port (SP) circuits and 2×2 printed patch antennas, each of the SP circuits having a pair of the patch antennas connected to their inputs, one pair being separated horizontally in a Cartesian plane, the other pair being separated vertically. The output ports are connected to differential amplifiers that produce in-phase and quadrature signals, which are digitized and input to a digital signal processor, which computes the difference in phase for the signals received at each pair of antennas. The processor uses the differences in phase angles to compute both the azimuth and elevation of the received signals, and may do so simultaneously for signals in multiple bands in the microwave region.