Abstract: Utilizing the elliptic V-cone antenna (EVA) as a universal model, when k→ 0,the elliptic V-cone antenna retrogresses to a triangular V-plate antenna. The input impedance of the TVA can be derived through the EVA related formulas. The analysis shows that the TVA is a pure resistive antenna with a higher input impedance than that of corresponding EVA. The parameters and curves of the input impedances of three sorts of TVA are given. It is useful for engineering design.