A method of emulating real world conditions of a radio frequency (RF) signal reaching a device-under-test (DUT) includes exposing the DUT to a cone of RF signal angles of arrival transmitting coordinated RF signals from an antenna array. The antenna array has at least one antenna located at a center of the antenna array and at least three antennas located at substantially equal distance from the center and from each other. Such configuration of the antennas in the antenna array defines a base of the cone to have a range of angles of 20° to 70°. The cone of RF signal angles of arrival and the DUT may be enclosed in a chamber such as an anechoic chamber. The method sets an azimuth angle and/or an elevation angle of the DUT with respect to the transmitted RF signals.