An antenna structure includes a radiator element and an enclosure housing the radiator element therein. The enclosure includes a front face that is adjacent a surface of the radiator element and sidewall surfaces that house the radiator element therebetween. The front face of the enclosure has an internal surface that is bounded by the sidewall surfaces and an external surface that is opposite the internal surface. The surface of the radiator element is positioned closer to the external surface than the internal surface of the front face of the enclosure.