an antenna including : a first substantially planar ground plate ; a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate ; a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate ; two or more connectors for electrically connecting the second ground plate to ground ; and one or more connectors for electrically connecting the first resonator to the second ground plate ; wherein the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means .