Broadband high-power pylon antenna

An antenna, comprising:

• a plurality of stages, each stage comprising either one section or two or more adjacent sections of slotted coaxial antenna arranged in phase groups along a central vertical axis;
• and for each stage, an exterior feedline running parallel to the central vertical axis and radially exterior to the slotted outer layer of each section, the exterior feedline comprising a dummy portion, wherein:
• each section belongs to only one stage;
• the feedlines are space equally radially around the central vertical axis;
• each section comprises a cylindrical inner radiating layer with a first radius from the central vertical axis and a first height along the central vertical axis;
• each section comprises a cylindrical outer slotted layer with a second radius from the central vertical axis and a second height along the central vertical axis, the second radius being greater than the first radius;
• each outer slotted layer comprising an array of vertical slots, the array comprising a number of slots vertically and a number of slots radially, such that the number of slots per section is the product of the number of slots vertically and the number of slots radially;
• each phase group comprises one or more adjacent sections arranged along the central vertical axis, wherein each section belongs to only one phase group;
• and the antenna is driven such that a transmission phase of each phase group is separated from a transmission phase of any adjacent phase group by between 30 and 60 degrees.