An antenna (800, 1000), comprising: a dielectric material having i) a first side opposite a second side, and ii) a conductive via (116, 118) therein; a first planar conducting element (802, 1002) on the first side of the dielectric material, the first planar conducting element having an electrical connection to the conductive via; a second planar conducting element on the first side of the dielectric material, wherein the first and second planar conducting elements are separated by a gap that electrically isolates the first planar conducting element from the second planar conducting element; and an electrical microstrip feed line on the second side of the dielectric material, the electrical microstrip feed line electrically connected to the conductive via and having a route extending from the conductive via, to across the gap, to under the second planar conducting element, and the second planar conducting element providing a reference plane for both the electrical microstrip feed line and the first planar conducting element; wherein the first planar conducting element has a plurality of electromagnetic radiators (804, 806, 808, 1010, 1012, 1014), each radiator having dimensions that cause it to resonate over a range of frequencies that differs from a range of frequencies over which an adjacent radiator resonates, and at least first (804, 1010) and second (806, 1012) of the radiators bounding an open slot (812, 1004) in the first planar conducting element, characterised in that an opening of the open slot (812, 1004) faces away from the gap, the conductive via is positioned on a conductive pad with a conductive protrusion towards the gap, and the route of the electrical microstrip feed line changes direction under the second planar conducting element. a dielectric material having i) a first side opposite a second side, and ii) a conductive via (116, 118) therein; a first planar conducting element (802, 1002) on the first side of the dielectric material, the first planar conducting element having an electrical connection to the conductive via; a second planar conducting element on the first side of the dielectric material, wherein the first and second planar conducting elements are separated by a gap that electrically isolates the first planar conducting element from the second planar conducting element; and an electrical microstrip feed line on the second side of the dielectric material, the electrical microstrip feed line electrically connected to the conductive via and having a route extending from the conductive via, to across the gap, to under the second planar conducting element, and the second planar conducting element providing a reference plane for both the electrical microstrip feed line and the first planar conducting element; wherein the first planar conducting element has a plurality of electromagnetic radiators (804, 806, 808, 1010, 1012, 1014), each radiator having dimensions that cause it to resonate over a range of frequencies that differs from a range of frequencies over which an adjacent radiator resonates, and at least first (804, 1010) and second (806, 1012) of the radiators bounding an open slot (812, 1004) in the first planar conducting element, characterised in that an opening of the open slot (812, 1004) faces away from the gap, the conductive via is positioned on a conductive pad with a conductive protrusion towards the gap, and the route of the electrical microstrip feed line changes direction under the second planar conducting element.