The standard ground plane antenna consists of a vertical radiator which is insulated and centred between 4 horizontal surrounding radials which extend out from the base of the antenna. Each radial is evenly spaced 90 degrees or so from each other around the vertical element.

Enter the formula for the antenna calculation (normally 234/f):

The vertical length is

The 4 radials are each

The half wave vertical antenna consists of a vertical radiator which is fed from the bottom of the antenna. A matching device should be added between the antenna and the feed line if you wish to use coax.

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

Switch to:

Your half wave antenna's vertical length is

The cubical quad antenna is a four sided antenna, with each side a quarter wave length long. Several factors influence the performance of the antenna, such as :

The antenna height above the ground

The diameter of the wire used

Nearby structures to where the antenna is mounted

Effects of other antennas or metal objects in the area

The conductivity of the soil

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

Your quad's total length is

Each of the 4 sides are

Most familiar are the centerfed, half wave dipoles and inverted vees that are so popular.

A basic formula for these types of antennas is below. For center fed, wire dipole antennas, the formula is 468/freq(mhz).

Enter the formula for the antenna:

Your
dipole's total length is

Your Inverted Vee's total length is