A radio wave device test system, comprising: 1.1 a fixed part configured to fix a radio wave device; 1.2 a positioner system configured to control a rotation of the radio wave device by controlling the fixed part; 1.3 an arch structure whose central point is located at a position where the radio wave device is located; 1.4 a plurality of probes disposed to be spaced apart from one another at fixed intervals in the arch structure, and configured to receive a radio frequency signal from the radio wave device; 1.5 a plurality of receiving modules located at the plurality of probes, respectively, and configured to transform the RF signal into in-phase/quadrature (I/Q) data by carrying out digital transformation for the RF signal and to detect information on amplitude and a phase from the I/Q data; and 1.6 wherein each of the probes comprises: a main body in which a wave guide whose section has a circular shape is formed, the wave guide including an aperture whose beam width increases in an elevation direction; two pairs of ridges formed to make the pairs and to cross in a cross on an inside surface of the aperture; a first conductor connected to a first pair of ridges of said two pairs of ridges; a second conductor connected to a second pair of ridges of said two pairs of ridges; and feeding points (121A, 121B) connected to the first conductor and the second conductor; and 1.7 wherein respective tip parts of said two conductors are located in their respective grooves extending by passing through a center of the main body of the probe. 1.1 a fixed part configured to fix a radio wave device; 1.2 a positioner system configured to control a rotation of the radio wave device by controlling the fixed part; 1.3 an arch structure whose central point is located at a position where the radio wave device is located; 1.4 a plurality of probes disposed to be spaced apart from one another at fixed intervals in the arch structure, and configured to receive a radio frequency signal from the radio wave device; 1.5 a plurality of receiving modules located at the plurality of probes, respectively, and configured to transform the RF signal into in-phase/quadrature (I/Q) data by carrying out digital transformation for the RF signal and to detect information on amplitude and a phase from the I/Q data; and 1.6 wherein each of the probes comprises: a main body in which a wave guide whose section has a circular shape is formed, the wave guide including an aperture whose beam width increases in an elevation direction; two pairs of ridges formed to make the pairs and to cross in a cross on an inside surface of the aperture; a first conductor connected to a first pair of ridges of said two pairs of ridges; a second conductor connected to a second pair of ridges of said two pairs of ridges; and feeding points (121A, 121B) connected to the first conductor and the second conductor; and a main body in which a wave guide whose section has a circular shape is formed, the wave guide including an aperture whose beam width increases in an elevation direction; two pairs of ridges formed to make the pairs and to cross in a cross on an inside surface of the aperture; a first conductor connected to a first pair of ridges of said two pairs of ridges; a second conductor connected to a second pair of ridges of said two pairs of ridges; and feeding points (121A, 121B) connected to the first conductor and the second conductor; and 1.7 wherein respective tip parts of said two conductors are located in their respective grooves extending by passing through a center of the main body of the probe.