Ridging waveguide has the characteristics of increasing cut-off wavelength to reduce waveguide wavelength and widening working wavelength range of single mode. Therefore, ridging waveguide can be used for TACAN antenna with working frequency band width up to 25 % to solve the existing contradiction. Moreover, the equivalent impedance of the ridge waveguide is low, which makes it convenient for the vertical array to be connected with the impedance of the amplitude-controlled horizontal power divider PIN amplitude modulator. The ridge waveguide slotted vertical array realizes vertical power distribution and vertical phase distribution within itself, thus 36 vertical power dividers are saved. The vertical array is formed by pure machining, which can improve the reliability of the equipment. In addition, the mutual coupling between elements decreases and the vertical gain increases.