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3M aluminum foil adhesive backed tape in a 2 - 2.5 inch width can be used to lay out a ground plane grid either underneath or on the top of the fiberglas roof. i make it a rule to avoid side panel and bumper mounts. antennas don't perform well when the body running away from the base of the antenna is higher than the mount, causes the antenna to become electrically shorter with metal in the near field, becomes directional in the direction away from the body metal and becomes difficult to establish both the impedance match and resonance.

don't forget the hd spring and ball mount (the other 6.5 inches) as they contribute to the total electrical length and the (Rrad) radiation resistance of the antenna in addition to the 102" inch whip.

[QUOTE="freecell, post: 771246, member: 30"] 3M aluminum foil adhesive backed tape in a 2 - 2.5 inch width can be used to lay out a ground plane grid either underneath or on the top of the fiberglas roof. i make it a rule to avoid side panel and bumper mounts. antennas don't perform well when the body running away from the base of the antenna is higher than the mount, causes the antenna to become electrically shorter with metal in the near field, becomes directional in the direction away from the body metal and becomes difficult to establish both the impedance match and resonance. don't forget the hd spring and ball mount (the other 6.5 inches) as they contribute to the total electrical length and the (Rrad) radiation resistance of the antenna in addition to the 102" inch whip. [/QUOTE]

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