The positions of transmitting (red) and receiving (blue) antennas. We employ two possible receive antenna placement patterns. As seen on the left part, the antennas 1a and 2a occupy the left and right top corners of the windshield, while on the right part, the antennas 1b and 2b are positioned in the lower corners. Please note that all measurements have been measured for various passenger layouts. We have considered (1) empty vehicle and (2) driver and two to three passengers.