An antenna element preferably for a base station antenna, the antenna element comprising: - a support structure being a single part and comprising a foot, a top and a wall connecting the foot to the top, the wall surrounding a hollow area; - a first metallization arranged on a first surface area of the support structure, the first metallization forming at least a first radiating element extending along the wall from the foot to the top; - a second metallization arranged on a second surface area of the support structure, the second metallization forming at least a first feeding circuit for the first radiating element; - wherein the first surface area of the support structure and the second surface area of the support structure are arranged opposite to each other, and wherein either the first surface area or the second surface area is adjacent to the hollow area; the antenna element being characterized in that: - the support structure further comprises a third surface area surrounding the hollow area and extending in an orthogonal direction compared to an extension direction of the wall between the foot and the top; - the first metallization further extends along the third surface area; and in that - the antenna element further comprises on the support structure an electrically closed ring and a non-conducting gap, wherein: - the electrically closed ring surrounds the first radiating element; - the non-conducting gap isolates the first radiating element and the electrically closed ring from each other; and wherein a) the electrically closed ring is arranged on the third surface area; or b) the support structure further comprises a fourth surface area surrounding the hollow area and extending from an edge of the third surface area distant from the wall in an extension direction of the wall between the top and the foot, the electrically closed ring is arranged on the fourth surface area or on both the third surface area and the fourth surface area, and the non-conducting gap is arranged on the third surface area or the fourth surface area. - a support structure being a single part and comprising a foot, a top and a wall connecting the foot to the top, the wall surrounding a hollow area; - a first metallization arranged on a first surface area of the support structure, the first metallization forming at least a first radiating element extending along the wall from the foot to the top; - a second metallization arranged on a second surface area of the support structure, the second metallization forming at least a first feeding circuit for the first radiating element; - wherein the first surface area of the support structure and the second surface area of the support structure are arranged opposite to each other, and wherein either the first surface area or the second surface area is adjacent to the hollow area; - the support structure further comprises a third surface area surrounding the hollow area and extending in an orthogonal direction compared to an extension direction of the wall between the foot and the top; - the first metallization further extends along the third surface area; and in that - the antenna element further comprises on the support structure an electrically closed ring and a non-conducting gap, wherein: - the electrically closed ring surrounds the first radiating element; - the non-conducting gap isolates the first radiating element and the electrically closed ring from each other; and wherein a) the electrically closed ring is arranged on the third surface area; or b) the support structure further comprises a fourth surface area surrounding the hollow area and extending from an edge of the third surface area distant from the wall in an extension direction of the wall between the top and the foot, the electrically closed ring is arranged on the fourth surface area or on both the third surface area and the fourth surface area, and the non-conducting gap is arranged on the third surface area or the fourth surface area. a) the electrically closed ring is arranged on the third surface area; or b) the support structure further comprises a fourth surface area surrounding the hollow area and extending from an edge of the third surface area distant from the wall in an extension direction of the wall between the top and the foot, the electrically closed ring is arranged on the fourth surface area or on both the third surface area and the fourth surface area, and the non-conducting gap is arranged on the third surface area or the fourth surface area.