Abstract: A window-mounted cellular mobile telephone antenna includes an outside module for mounting on the outside surface of a vehicle window in registration with an inside module mounted on the inside surface of the window. The outside module includes a capacitive coupling element and a generally vertical radiating element not less than 5/8 wavelength at the antenna operating frequency. The inside module includes a self-contained electrical circuit forming a ground-plane for the radiating element, an inductor for matching the impedance of the radiating element to that of a coaxial feedline, and a capacitive coupling element interacting with the coupling element of the outside module and the dielectric of the window glass to form a coupling capacitor. The length of the radiating element may be increased beyond 5/8 wavelength to reduce impedance matching requirements in the inside module.