A system configured to test a device under test, DUT, in an anechoic chamber via one of a plurality of testing modes, the DUT being an active device capable of responding to a signal, the system comprising: a first positioner having a first antenna, the first positioner being a first robotic arm having a plurality of joints configured to provide at least three degrees of freedom to enable variation of position of an end of the first robotic arm about the DUT, the first positioner responsive to generated commands to move the first antenna to a determined first set of at least one position about the DUT; a second positioner having a second antenna, the second positioner being a second robotic arm having a plurality of joints configured to provide at least three degrees of freedom to enable variation of position of an end of the second robotic arm about the DUT, the second antenna responsive to generated commands to move the second antenna to a determined second set of at least one position about the DUT; circuitry configured to: implement one of a plurality of testing modes, the plurality of testing modes including: a probing mode which causes, for each of at least one position of the first antenna, the second antenna to receive a signal from the DUT at each of the second set of positions of the second antenna, the received signal from the DUT being responsive to a signal from the first antenna; and an interfering mode which causes, for each of at least one position of the first antenna, from which the first antenna sends a communication signal to the DUT, the second antenna to transmit an interfering signal to the DUT at each of the second set of positions of the second antenna to enable measurement of a response of the DUT to the interfering signal via one of the first antenna and the DUT. a first positioner having a first antenna, the first positioner being a first robotic arm having a plurality of joints configured to provide at least three degrees of freedom to enable variation of position of an end of the first robotic arm about the DUT, the first positioner responsive to generated commands to move the first antenna to a determined first set of at least one position about the DUT; a second positioner having a second antenna, the second positioner being a second robotic arm having a plurality of joints configured to provide at least three degrees of freedom to enable variation of position of an end of the second robotic arm about the DUT, the second antenna responsive to generated commands to move the second antenna to a determined second set of at least one position about the DUT; circuitry configured to: implement one of a plurality of testing modes, the plurality of testing modes including: a probing mode which causes, for each of at least one position of the first antenna, the second antenna to receive a signal from the DUT at each of the second set of positions of the second antenna, the received signal from the DUT being responsive to a signal from the first antenna; and an interfering mode which causes, for each of at least one position of the first antenna, from which the first antenna sends a communication signal to the DUT, the second antenna to transmit an interfering signal to the DUT at each of the second set of positions of the second antenna to enable measurement of a response of the DUT to the interfering signal via one of the first antenna and the DUT. a probing mode which causes, for each of at least one position of the first antenna, the second antenna to receive a signal from the DUT at each of the second set of positions of the second antenna, the received signal from the DUT being responsive to a signal from the first antenna; and an interfering mode which causes, for each of at least one position of the first antenna, from which the first antenna sends a communication signal to the DUT, the second antenna to transmit an interfering signal to the DUT at each of the second set of positions of the second antenna to enable measurement of a response of the DUT to the interfering signal via one of the first antenna and the DUT.