Since the rack is too small to be the ground plane it may try to become part of the antenna and really cause problems usually associated with interference of some kind.
Roof rack ground plane.
If the rack is not grounded then you will need to ground it in order to use a standard ground plane gp dependent antenna system.
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As the name indicates the antenna ground plane acts as a simulated ground.
A one foot square chunk of metal on the roof of a motorhome falls under the catagory of lack of sufficient ground plane mass.
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But if you don t have at least9 square feet of metal 3ft x 3ft don t even fool with a gp set up.
It is possible to simulate this function by replacing the real earth.
Although ground mounted systems are less common they offer important benefits including.
Many times a rack mounted antenna will cause the cb transmission to come across the fm stereo loud and clear while at the same time other cbs will not be able to pick up the signal at any distance.
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First of all find the metal.
These mounts can also be used on other flat horizontal surfaces.
Every antenna has a somewhat different requirement.
The ground plane needs to appear solid to the rf radiation in order to effectively radiate its energy out in a usable pattern.
We offer all sorts of options for mounting an antenna on a vehicle roof.
Installation size if your property has a lot of unused land you can install a much larger pv system and generate even higher savings.
If you do not want to ground it then you will need to use a no ground plane ngp antenna system.
So a roof rack would have to have a metal or wire mesh floor in order to be a good gp.
It is found that for a monopole antenna like a quarter wavelength vertical the ground acts as a plane to reflect the radio waves so that an image of the top half of the antenna is seen in the earth.