The Glass Mount Antenna may be mounted along the top of the front or rear window. For best performance don't mount or rear window of trucks or SUV's. Check to ensure your mounting location won't interfere with windshield wiper operation. Keep the antenna away from the defogger wires. If the antenna must be mounted on the defogger, center it between the defogger wires as much as possible. Clean the exterior window surface with window cleaner. Be sure the same location inside the window is clear of obstacles. Remove the protective paper on the base to expose the adhesive pad and firmly press the antenna into place on the outside of the window. Note: If installing on a home or office window, ensure that it is not dual pane glass.