divided by Freq. MHZ

The vertical length is feet.

The 4 radials are each feet.

Halfwave Verticals

The halfwave vertical antenna consists of a vertical radiator which is fed from the bottom of the antenna. A matching device MUST be added between the antenna and the feedline if you wish to use coax cable. Adding a coil in series with the antenna at the base is one way of doing this.

Enter the formula for the antenna calculation
(normally 468/f):

Switch to:

divided by Freq. MHZ

Your halfwave antenna's vertical length is

Enter the formula for the antenna (normally 1005/f):

divided by Freq. MHZ

Your quad's total length is feet

Each of the 4 sides are feet.

5/8th Wave Vertical Antenna

The 5/8 wave antenna consists of a vertical radiator which is fed at the bottom of the antenna. A matching device such as a coil in series with the antenna must be used if you wish to feed it with coax.

Enter the formula for the antenna (normally 585/f or 178.308/f for metric):

Switch to:

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Your 5/8 wave antenna's Vertical element is

Dipole and Inverted Vee Antennas

Most people are familiar with the center fed, halfwave dipoles and inverted vees that are so popular. There is no exact formula for calculating these antennas. The problem is that there are several factors that affect the antenna.

Fortunately there is a starting formula for these types of antennas. For center fed, wire dipole antennas, the formula is 468/freq(mhz).

Enter the formula for the antenna:

Your dipole's total length is feet.
Each leg of the dipole is feet.

Your Inverted Vee's total length is feet.
Each leg of the Inverted Vee is feet.