Many antennas are designed to need a ground plane to function properly, especially the common magnetic-mount antennas many cellular boosters come with.
A ground plane is created by providing a metal surface underneath the antenna. Steel works great (like a car roof), and the magnetic antennas stick beautifully to roofs like this. But aluminum also works as a ground plane – you just need to find a different way to hold the antenna secure to the nonmagnetic surface.
A rubber or fiberglass roof is useless as a ground plane, but you can instead use a small metal disk attached with adhesive to create one. A 3.5" diameter disk would be minimum, and 8" or more is better. Some people actually use a cookie sheet!« Back to Glossary Index