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  1. #1
    Senior Member dhalltoyo's Avatar
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    CB Ground Plane With Fiberglass Body?

    The new truck is comprised of a GM cutaway van body and a fiberglass cargo box.

    The cutaway van roof is also cut out and that area is fiberglass too.

    So where do I mount a CB antenna for the best reception?

    I thought about a full length whip off the metal rear bumber.

    What say the EO Engineering Department?
    A true friend is one who knows all about us and still loves us.

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  4. #2
    Moderator Turtle's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    All you're gonna need is a No-Ground Plane antenna kit (Firestick makes good ones, as does Wilson). Motorhomes, boats, most 18-wheelers, they don't have metal bodies anymore, and No-Ground Plane antennas work well. You can mount it on the mirror, the bumper (tho the entire van seems like an awful lot that the signal is gonna have to pass through to get out), or on the roof. A really good spot, actually, would be on the vertical side wall above the driver's door on that slope.



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  5. 2,246439,31121,8
  6. #3
    Senior Moderator davekc's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    Agree with Turtle. Boat antennas work real well.
    fleet owner
    29 years
    Panther & Load One


  7. 3,246447,31121,8
  8. #4
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    Re: CB Ground Plane With Fiberglass Body?

    I don't know about boat antennas but ship antennas are grounded to the water through the hull. Ground plain antennas do work better than non-ground plain antennas, but they do require proper grounding to get the SWR right. I have a metal mirror mounts but they were not grounded to the frame of the truck which puzzled the heck out of me, so I ended up running a separate ground from the antenna to the door, which fixed the swr.

    So if push comes to shove you can mount the antenna anywhere you want and the run a separate ground to a steel part of the vehical.

    The point is to get the swr right so you don't burn up your radio so whatever you do make sure you check that.
    The firestick website has plenty of info on how to install an antenna right.
    Last edited by EASYTRADER; 04-24-2008 at 09:46 AM.

  9. 4,246448,31121,8
  10. #5
    18K Member greg334's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    Quote Originally Posted by Turtle View Post
    All you're gonna need is a No-Ground Plane antenna kit (Firestick makes good ones, as does Wilson). Motorhomes, boats, most 18-wheelers, they don't have metal bodies anymore, and No-Ground Plane antennas work well. You can mount it on the mirror, the bumper (tho the entire van seems like an awful lot that the signal is gonna have to pass through to get out), or on the roof. A really good spot, actually, would be on the vertical side wall above the driver's door on that slope.
    Ah Turtle, the last time I checked, tractors were metal.

    Motorhomes are close to what David has, Boats use water as a ground plane and pose a unique situation because there needs to be some conductor to make that connection of the water and the antenna system.

    A ground plane is part of the antenna system to act like a reflector. Trucks use the cab/sleeper as a reflective surface - ground plane, Vans and cars use the roof.

    Firestik seems to think that aluminum is not a reflective material, funny that all base antennas are made out of aluminum.

    Motorhomes with a fiberglass roofs pose two problems, one is many have a rubber roof coating and the other is that that many lack a real metal structure to mount the antenna on it. I don't remember if it is fleetwood or another manufacture that uses no metal in the roof.

    The antennas that they sell are not really that great in comparison to other configurations. They claim great gain but....

    I did see someone take a short antenna, like a K40 and used a three foot square piece of 22 gauge metal plate mounted inside of the box and grounded to the chassis and the antenna was mounted to the metal plate through the roof giving enough ground plane surface area. The metal also reinforces the fiberglass roof so the stress does not crack the roof.

  11. 5,246452,31121,8
  12. #6
    Senior Member highway star's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    My M2 is fiberglass. The guys at Exit 99 in Anna, Oh replaced one of the mirror mount bolts with a stud and mounted the antenna to that. They tried several antennas and got the best match from a Wilson 2000. It's not 1:1, but it's not too bad.


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  14. #7
    18K Member greg334's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    Quote Originally Posted by highway star View Post
    My M2 is fiberglass. The guys at Exit 99 in Anna, Oh replaced one of the mirror mount bolts with a stud and mounted the antenna to that. They tried several antennas and got the best match from a Wilson 2000. It's not 1:1, but it's not too bad.
    Seriously..... your M2 is a complete fiberglass cab?

    I saw one ripped part from an accident and it wasn't all fiberglass or did I miss something?

    Beside the website and Turtle said 18 wheelers.
    Last edited by greg334; 04-24-2008 at 11:32 AM.

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  16. #8
    Senior Member highway star's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    The skin is fiberglass.


    Livin' the dream
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  17. 8,246463,31121,8
  18. #9
    18K Member greg334's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    Quote Originally Posted by highway star View Post
    The skin is fiberglass.
    Well you may be right but I looked at my M2 body manual and see some parts of the cab being fiberglass, but there is metal there.

  19. 9,246471,31121,8
  20. #10
    Senior Member Moot's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    David, I like your idea of a full wave whip mounted on the rear bumper. With a roll up door it shouldn't be a problem.

    I have a 36" tune-able steel whip on a bracket that is screwed to the inside of the driver's side fender and sticks out between the hood/fender gap. This setup works great for me and allows me to park my van inside my garage. When I get a chance I will shoot and post a pic.


    "I guess that is why I enjoy expediting. Kinda like standing in front of a giant roulette wheel." davekc

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  22. #11
    Senior Member dhalltoyo's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    Moot,

    I have seen that bracket advertised on the web.

    The guys at Movin' On Electronics (Exit 99/I-75) even suggested that bracket when I talked with them yesterday.

    They did the roof mount on the current van. It gets excellent reception. All the cables were completely hidden. It is a very professional installation.
    A true friend is one who knows all about us and still loves us.

  23. 11,246500,31121,8
  24. #12
    Administrator Dreamer's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    Dave,
    Wanted to throw a couple more ideas at ya.

    An antenna off the rear bumper will work, but I wouldn't go with a 102 steel whip. While they outplay most antennas, they are a pain... every branch, drivethru, etc will cause it to sway wildly, turning it into a weapon.. believe me I know.. LOL. A better idea would be a long fiberglass whip on a steel flat bar coming off the side of the rear bumper... like this one.

    MODEL T655 Horizontal Antenna Bumper Mount - eBay (item 150239135411 end time Apr-28-08 18:16:10 PDT)


    Alternatively, you could run a side mount on the side of the box, and run a 'no ground' 4 foot fiberglass antenna. I would mount it right behind your side door, and just high enough to get the tip over your box. It would require 3 holes.. 2 for bolts, and one for the coax to run thru.

    FIRESTIK MKM2 CB or Ham Radio Antenna SIDE MOUNT New - eBay (item 360045755654 end time Apr-29-08 20:20:00 PDT)



    Dale
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  25. 12,246542,31121,8
  26. #13
    Senior Member Packmule's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    David,
    I too have a lot of fiberglass on the Packvan roof as you do on yours. For what its worth, my solution was to go to Junk Shack....I mean Radio Shack and purchase a glass mount antenna that I mounted just above where the rear view mirror would have been, close to the headliner, so I could hide the coax in the headliner and run it down the side of the windshield moulding to under the dash. The antenna mounts on both sides of the glass with a special adhesive and has a tunable SWR adjustment on the inside part. This is the same type that was used for Car Phones years ago and normally mounted on the rear window.
    Mine works great! Price was about $24.95 if I remember correctly.
    I don't run any power on my CB so I don't know how it would work for that type application, but just normal CB Transmission it is Great.
    Danny

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  27. 13,246618,31121,8
  28. #14
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    Re: CB Ground Plane With Fiberglass Body?


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  30. #15
    Senior Member Moot's Avatar
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    Re: CB Ground Plane With Fiberglass Body?

    Inside fender mount:
    Attached Images Attached Images


    "I guess that is why I enjoy expediting. Kinda like standing in front of a giant roulette wheel." davekc

    "I wonder why I'm not quoted at the bottom of Moot's posts?"
    Highway Star


    "Shane runs 70 PSI all around." scottm4211

    "Embrace the mundane." mrgoodtude

    "I think, therefore I van". Mouton Descrouton


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