An over-the-air, in the following also referred to as OTA, wireless test system, comprising: a container; a load board; a socket disposed on the load board; and a wave-guiding feature (510, 520, 410, 420) in the socket and the load board configured to pass and guide electromagnetic waves to and/or from an antenna structure (610, 620) of a device under test, in the following also referred to as DUT, installed in the socket; characterized by a machine plate disposed on the container, wherein the machine plate covers an opening of the container, thereby defining a testing chamber; and a supporter disposed on the machine plate, wherein the supporter is a metal supporter comprising two leg portions and a top plate, wherein the top plate is integrally formed with the two leg portions and comprises a through opening (310, 320), wherein the supporter has two opposite sidewall surfaces, and wherein each of the two opposite sidewall surfaces is adhered with an electromagnetic wave absorber material layer; wherein an object to be tested and/or a test antenna is positioned in the testing chamber; wherein the load board is disposed on the supporter; wherein the wave-guiding feature (510, 520, 410, 420) comprises a radiation passage (410, 420) in the load board defined by rows of via fence extending through an entire thickness of the load board; wherein the through opening (310, 320) is aligned with the radiation passage in the load board; and wherein the machine plate, the supporter and the electromagnetic wave absorber material layers define an enclosed space for the passage of the electromagnetic waves to and/or from the antenna structure (610, 620) of the DUT. a container; a load board; a socket disposed on the load board; and a wave-guiding feature (510, 520, 410, 420) in the socket and the load board configured to pass and guide electromagnetic waves to and/or from an antenna structure (610, 620) of a device under test, in the following also referred to as DUT, installed in the socket; characterized by a machine plate disposed on the container, wherein the machine plate covers an opening of the container, thereby defining a testing chamber; and a supporter disposed on the machine plate, wherein the supporter is a metal supporter comprising two leg portions and a top plate, wherein the top plate is integrally formed with the two leg portions and comprises a through opening (310, 320), wherein the supporter has two opposite sidewall surfaces, and wherein each of the two opposite sidewall surfaces is adhered with an electromagnetic wave absorber material layer; wherein an object to be tested and/or a test antenna is positioned in the testing chamber; wherein the load board is disposed on the supporter; wherein the wave-guiding feature (510, 520, 410, 420) comprises a radiation passage (410, 420) in the load board defined by rows of via fence extending through an entire thickness of the load board; wherein the through opening (310, 320) is aligned with the radiation passage in the load board; and wherein the machine plate, the supporter and the electromagnetic wave absorber material layers define an enclosed space for the passage of the electromagnetic waves to and/or from the antenna structure (610, 620) of the DUT.