A measurement arrangement for measuring the performance of a device under test , comprising: a chamber defining an internal cavity therein, adapted to enclose the device under test , and including walls having inwardly facing surfaces of an electromagnetically reflective material, thereby simulating a multi-path environment; at least one first chamber antenna arranged in the cavity and configured to transmit and receive electromagnetic waves having a frequency within a first predefined frequency range, at least one second chamber antenna arranged in the cavity , a measuring instrument connected to the device under test and the first chamber antenna and the second chamber antenna , for measuring the transmission between said device under test and the chamber antennas ; characterized in that the at least one second chamber antenna is configured to transmit and receive electromagnetic waves having a frequency within a second predefined frequency range, wherein said first predefined frequency range is at a higher frequency band than said second predefined frequency range, and wherein said first and second predefined frequency ranges are distinct and non-overlapping in relation to each other; in that said at least one first chamber antenna and said at least one second chamber antenna are arranged to operate simultaneously; and in that said measurement arrangement further comprises at least one frequency selective absorber arranged in the cavity , said frequency selective absorber being arranged to absorb electromagnetic waves having a frequency within said first predefined frequency range and reflect electromagnetic waves having a frequency within said second predefined frequency range. a chamber defining an internal cavity therein, adapted to enclose the device under test , and including walls having inwardly facing surfaces of an electromagnetically reflective material, thereby simulating a multi-path environment; at least one first chamber antenna arranged in the cavity and configured to transmit and receive electromagnetic waves having a frequency within a first predefined frequency range, at least one second chamber antenna arranged in the cavity , a measuring instrument connected to the device under test and the first chamber antenna and the second chamber antenna , for measuring the transmission between said device under test and the chamber antennas ; characterized in that the at least one second chamber antenna is configured to transmit and receive electromagnetic waves having a frequency within a second predefined frequency range, wherein said first predefined frequency range is at a higher frequency band than said second predefined frequency range, and wherein said first and second predefined frequency ranges are distinct and non-overlapping in relation to each other; in that said at least one first chamber antenna and said at least one second chamber antenna are arranged to operate simultaneously; and in that said measurement arrangement further comprises at least one frequency selective absorber arranged in the cavity , said frequency selective absorber being arranged to absorb electromagnetic waves having a frequency within said first predefined frequency range and reflect electromagnetic waves having a frequency within said second predefined frequency range. <EOS>