the cylinders 138 is rotated by a related rotation mechanism such as an electric motor 139 as with the embodiment of the invention illustrated in fig1 u2013 15 and as illustrated in fig1 the axis of rotation of each of the high dielectric cylinders is offset from the axis of rotation of its related motor 139 as a result as the motors rotate their respective cylinders the air gap between the cylinders and the phase shift transmission lines of their respective corporate feeds change whereby the time delay or phase shift of the phase shift transmission lines of the corporate feed changes in synchronism as will be readily appreciated by those skilled in this art and others the antenna assemblies illustrated in fig6 u2013 18 are based on an electromechanical system for controlling the air gap between a high permittivity dielectric layer or cylinder and the phase shift transmission lines of a corporate feed because the air gap changes in synchronization for all of the corporate feed phase shift transmission lines the same time delay or phase shift change occurs for each incremental section of the phase shift transmission lines because as illustrated in fig5 and discussed above individual sections have different lengths related by the factor u00bd the delays per phase shift transmission line are mathematically related because the incremental amount of change remains constant the mathematical relationship between the various phase shift transmission lines remains constant even though the total delay of each phase shift transmission line.