Antenna Ground Plane

The ground plane is acting as a blocking device. It is made of any material that attenuates (or totally blocks or reflects) RF signals. It creates a shadow area for the antenna to hide in. That shadow is a cone above the ground plane. Any signals that come down from the satellites and are bouncing back upward from the earth can’t get to the antenna. Only signals coming directly from above can get to the antenna.

There are other aspects to the ground plane but that is the main one.

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