Posted by spacecadet9 on May 23, 2013 at 19:45:01 from (69.161.33.52):
In Reply to: cb radios posted by boberjagel on May 22, 2013 at 19:36:54:
Quoting Removed, click Modern View to see Most mobile cb antennas are 1/4 wavelength (108"). To make them shorter a 'load' is created by winding wire closely in a section of the length. The load might be at the bottom, center, top, or continuous. The RF current is a sine wave which in a 1/4 wave is stronger at the bottom. In theory a base loaded antenna should not perform as well as a top loaded antenna. In practice the location and body shielding will have a bigger impact on the performance of similar quality antennae. The common antenna needs a ground plane (metal) to properly perform. I know some tractor cabs are made of fiberglass or molded plastic. On those nonmetallic cabs one needs to add a ground plane. Ground plane kits are available from marine supply stores, or you can try using metal tape applied in an X (2 or more strips) with the antenna mounted in the center, where the tapes cross each other. Another option on a nonmetallic surface is a marine CB antenna. If you decide to go with a fiberglass antenna, check out Francis Antennas. They are continuous load, the wire is inside the fiberglass (less damage when you hit something hard like a tree limb), and are available at many truck stops. If a full 1/4 wave stainless steel whip and any shorter (6' or less) loaded antenna are mounted in the same spot, the full length will perform better. A 108" (102" whip with a 6" spring) sticking up from the top of your tractor cab would be noticed though. BTW: ever notice all the loaded antennas on cop cars are base loaded?
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