An over-the-air (OTA) measurement system for testing a device under test (12), with a plurality of feed antennas (24, 26), a test location (16) for the device under test (12), and a reflector array (28) with a main reflector (30) and a sub-reflector (32). The plurality of feed antennas (24 ,26) face the sub-reflector (32). The reflector array (28) is located such that a signal path (24) is established between the plurality of feed antennas (24, 26) and the test location (16) via the sub-reflector (32) and the main reflector (30). The sub-reflector (32) has at least one focal point (36). The plurality of feed antennas (24, 26) comprise a first feed antenna (24) and at least one second feed antenna (26). The first feed antenna (24) is associated with the focal point (36) of the sub-reflector (32). The at least one second feed antenna (26) is located offset from the focal point (36) of the sub-reflector (32). Further, a method of testing a device under test (12) over-the-air is described.