An antenna assembly having a first axis, the antenna assembly comprising: a first, second and third antenna sections, wherein the first antenna section is linearly between the second antenna section and the third antenna section, wherein the first, second and third antenna sections are aligned along the first axis, further wherein each of the first, second and third antenna sections include: an elongate trough extending in the first axis, wherein the elongate trough comprises a first wall, a second wall, and a base extending between the first wall and the second wall, wherein the trough is open between the first wall and the second wall, and the opening between the first wall and the second wall has a width that is larger than a width at the base, a radiator array comprising an array of radiator elements arranged in a line at the base along the first axis, a corrugation on the first wall along an edge of the first wall opposite the base comprising a plurality of ridges extending in the first axis, and a corrugation on the second wall along an edge of the second wall opposite the base comprising a plurality of ridges extending in the first axis; and characterized in that the antenna assembly further comprises a first isolation plate between the first and second antenna section, and a second isolation plate between the second and third antenna sections, wherein the first and second isolation plates each comprise a plurality of ridges extending parallel to an outer of the first and second isolation plate, respectively, and forming a corrugation along the outer edge, formed by a stack of alternating-sized strips (1141, 1142, 1141', 1142') stacked atop each other. a first, second and third antenna sections, wherein the first antenna section is linearly between the second antenna section and the third antenna section, wherein the first, second and third antenna sections are aligned along the first axis, further wherein each of the first, second and third antenna sections include: an elongate trough extending in the first axis, wherein the elongate trough comprises a first wall, a second wall, and a base extending between the first wall and the second wall, wherein the trough is open between the first wall and the second wall, and the opening between the first wall and the second wall has a width that is larger than a width at the base, a radiator array comprising an array of radiator elements arranged in a line at the base along the first axis, a corrugation on the first wall along an edge of the first wall opposite the base comprising a plurality of ridges extending in the first axis, and a corrugation on the second wall along an edge of the second wall opposite the base comprising a plurality of ridges extending in the first axis; and an elongate trough extending in the first axis, wherein the elongate trough comprises a first wall, a second wall, and a base extending between the first wall and the second wall, wherein the trough is open between the first wall and the second wall, and the opening between the first wall and the second wall has a width that is larger than a width at the base, a radiator array comprising an array of radiator elements arranged in a line at the base along the first axis, a corrugation on the first wall along an edge of the first wall opposite the base comprising a plurality of ridges extending in the first axis, and a corrugation on the second wall along an edge of the second wall opposite the base comprising a plurality of ridges extending in the first axis; and characterized in that the antenna assembly further comprises a first isolation plate between the first and second antenna section, and a second isolation plate between the second and third antenna sections, wherein the first and second isolation plates each comprise a plurality of ridges extending parallel to an outer of the first and second isolation plate, respectively, and forming a corrugation along the outer edge, formed by a stack of alternating-sized strips (1141, 1142, 1141', 1142') stacked atop each other.