In article .com,
"LiveToBe100.org" wrote:

If you have a Ground Mounted, or an Above Ground Mounted vertical, can
you create a lobe by placing your radials pointed in the direction you
want the lobe to occure? or, does the lobe occure in the opposite
direction from which you have the radials pointed?

What is the optimum length for radials:

1/10 wavelength?

1/4 wavelength?

1/4 wavelength plus 2%?

1/2 wavelength?

1 wavelength?

2 wavelengths?


Is the optimum wavelength a function of where the vertical is mounted?
i.e. Ground Mounted or Above Grounded Mounted.

The basic antenna that responds to the far electric field from a
broadcast station is 1/2 wavelength formed by two elements of 1/4
wavelength each in line or 180 degrees apart. This is called a dipole
antenna.

The ground plane antenna is the same except that the two elements are 90
degrees apart with the driven element vertical and the counterpoise
element horizontal. The counterpoise element(s) in the ground plane
antenna need to be all around the base of the driven element so that the
antenna response pattern is the same in all directions. Four elements
equal spaced about the base is usually considered the minimum required
to get an even response around the antenna.

With one counterpoise element the maximum response with be in the
direction of that element.

This antenna can be mounted at ground level or at some level above it. I
don't understand what you want to know with the question "optimum
wavelength a function of where the vertical is mounted." Generally the
higher the antenna is mounted the better it will function but a ground
plane antenna will work well at ground level if it is in the clear.

--
Telamon
Ventura, California