Multi-sector antennas

An antenna assembly having a first axis, the antenna assembly comprising:

• a first antenna section that is linearly between a second antenna section and a third antenna section, wherein the first, second and third antenna sections are in 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,
• an opening into the trough between the first wall and the second wall, wherein the opening has a width that is larger than a width at the base,
• a radiator array comprises an array of radiator elements arranged in a line at the base along in 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
• 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 edge and forming a corrugation along the outer edge.