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):
divided by Freq. MHZ
The vertical length is feet. The 4 radials are each feet.
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: divided by Freq. MHZ
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 feet Each of the 4 sides are feet.
The 5/8 wave antenna consists of a vertical radiator fed at the bottom of the antenna. A matching device should be used if you feed it with coax.
Enter the formula for the antenna (normally 585/f or 178.308/f for metric):
Your 5/8 wave antenna's Vertical element is
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 feet. Each leg of the dipole is feet.
Your Inverted Vee's total length is feet. Each leg of the Inverted Vee is feet.