Abstract: An antenna assembly (10) for use in combination with a glass window (60) and a signal transmission line (110) carrying a electrical transmission signal (S) with a first connector (C) at one end and having a preselected electrical impedance is disclosed. The assembly (10) includes a conductive plate (70) secured to the window (60) and a radiating antenna (80) connected to the plate (70). A ground plane (40) with an aperture (50) therein is secured to the window (60). A feed substrate (30) is connected to the ground plane (40). A microstrip feedline (20) and a second connector (120) attached thereto are connected to the feed substrate (30). The microstrip feedline (20) has an electrical impedance approximately equal to the preselected electrical impedance.