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Unread 10-28-2006, 04:06 PM   #1
shmoken875
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cb antenna for fiberglass body?

what are the options for putting a cb antenna on a fiberglass body because I know you need a decent ground. my buddy's girlfried is trying to get him one.

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Unread 10-28-2006, 08:11 PM   #2
Rick_W
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Fire Stik No Ground-Plane Antenna Kit

3-way mount or molded side mount

http://www.firestik.com/CatalogFrame.htm
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Unread 10-28-2006, 08:19 PM   #3
CNY
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Head on down to the local marina. They know a thing or two about mounting antennas without a ground plane.

Oh, and as Rick points out... The problem is not lack of ground (you can always ground to metal or the battery). The problem is lack of ground plane.

http://en.wikipedia.org/wiki/Ground_plane
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Unread 10-28-2006, 09:13 PM   #4
shmoken875
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thanks fellas
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Unread 10-29-2006, 09:27 AM   #5
Ryuu600
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this is the reason truckers run co-phased antenna's. The truck body's are fiberglass.

The Jeep also has a less than optimal ground plane but it gets the job done. I'm gonna co-phase 2 102" whips just for fun.
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Unread 10-29-2006, 11:44 AM   #6
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If the antenna is mounted to the bumper, you can go with a conventional antenna. If you really want to mount it to the fiberglass body, you must use a no-groundplane mount. But be aware that no-groundplane antennas do not perform nearly as well as a conventionally mounted antenna does. A regular antenna that is mounted to the frame, bumper, or steel body makes use of the tub/chassis as part of the antenna which is called the groundplane. It's like doubling the size of the antenna. A non-groundplane antenna has to make do without all that so it doesn't perform nearly as well.
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Unread 10-29-2006, 12:10 PM   #7
KA5IVR
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Quote:
Originally Posted by Ryuu600
this is the reason truckers run co-phased antenna's. The truck body's are fiberglass.
What "Einstein" told you this? If you believe it, I have some Ocean Front property for sale in AZ. I think you mean counterpoise antennas and that is a different monster.

Trucker's run Co-Phased antennas because of the radiation patten, not fiberglass, and Jeeps are not wide enough to co-phase antennas on 11 meters unless you do it front and back.
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Unread 10-29-2006, 09:11 PM   #8
Ryuu600
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well thank you KA5IVR. I appreciate you correcting me on that. Do me a favor though and try to be a little less abrasive about it next time.
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Unread 10-30-2006, 06:05 AM   #9
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Mounting the Antenna in the rear of the vehicle to the bumper or on the tire carrier is the best over-all location.

You won't gain anything by mounting on the top of the vehicle except radiation pattern. If you get the antenna to work correctly on the top of the fiberglass top you will have a radiation pattern that is more circular, on the rear of the vehicle the pattern toward the front of the vehicle, which is usually where you want it.

Save a lot of headaches and mount it on the tire carrier...

Luck,

p.s. Ditto - KA5IVR
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Unread 10-30-2006, 10:09 AM   #10
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To add a little more... I have been thinking about this problem.

What would happen if a false ground was setup on the inside of teh fiberglass top?

Setup a counter poise (fake ground) by running a number of copper wires in different direction on the inside of the top. Would this be adequate to create a ground close to teh antenna ?

It has been done on HF setups where wire are run along the earth to create a grouns to bounce the signal off of.

Just thinking out loud.
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