An antenna element that includes a base plate, a first ground clustered pillar projecting from the base plate, a second ground clustered pillar projecting from the base plate and spaced apart from a first side of the first ground clustered pillar, a first ground member projecting from the base plate between the first ground clustered pillar and the second ground clustered pillar, wherein a distal end of the first ground member is configured to capacitively couple to the second ground clustered pillar, and a first signal member projecting from the base plate between the first ground clustered pillar and the first ground member, wherein the first signal member is electrically insulated from the base plate, the first ground clustered pillar, and the first ground member, and a distal end of the first signal member is configured to capacitively couple to the first ground clustered pillar.