Use Inverted Vee Antenna calculator to determine approximate dimensions of materials needed to build a inverted vee antenna. Over level ground, the minimum height for the apex (feedpoint) of an Inverted Vee is determined by the angle (downward slope) of the Vee legs. The values for 22°, 30°, 37° and 45° are 0.98, 0.97, 0.96 and 0.95 respectively, with sufficiently accurate for wire antennas.