User's Manual Part 6

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A good earth (ground) to the main body of the vehicle is essential for efficient
operation of the antenna. To achieve this clean all joints to bare metal and use
copper braid earth straps if any non-metallic joints are encountered.
After mounting the main body of the antenna, screw the black coil onto the antenna
body followed by the stainless steel whip.
Note:- Some models of the 910 antenna have a one piece spring and a stainless
steel whip in place of the coil and whip.