If you've ever played around with some of the antenna design programs you may realize that the formula for these types of antennas vary from about 476/f Mhz to 490/f MHz depending on the band and the height above ground!

Fortunately there is a

At least in theory, an inverted vee should be about 5% shorter than a dipole at the same frequency.

This page uses the standard formula, 468 / f MHz to calculate dipole lengths. You may change this number if you feel you know a better number to use as a starting point.

Enter the formula for the antenna calculation

Your dipole's total length is

Each leg of the dipole is

Your Inverted Vee's total length is

Each leg of the Inverted Vee is