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Thread: Mounting uhf antenna on defender wing top

  1. 7th August 2014, 05:38 PM #1
    defender_i_hardly_know_er
    defender_i_hardly_know_er is offline Fossicker
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    Mounting uhf antenna on defender wing top

    What do you think of installing this antenna on the plastic blank cover on my defender's wing top?

    [ame=http://www.ebay.com.au/itm/FLEXI-UHF-CB-FLEXIBLE-DIPOLE-ANTENNA-3dB-GAIN-suits-GME-UNIDEN-ORICOM-ICOM-/271283590395?pt=AU_Electronics_Radio_Equipment&has h=item3f29c314fb]Flexi UHF CB Flexible Dipole Antenna 3nu llGa inSui tsG MEUnid enOric omIc | eBay[/ame]

    (for people from the future that might click on this thread, it's a fairy short 3db antenna)

    I'm only interested in talking to people that might be in convoy or something - it's not like I'm crossing dunes - but most antenna's are way longer than this one - but I have no idea what is adequate and what is excessive especially in that position on the car.
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  2. 7th August 2014, 06:08 PM #2
    chopper
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    it would be better if it were earthed onto a metal "ground plane"
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  3. 7th August 2014, 06:39 PM #3
    defender_i_hardly_know_er
    defender_i_hardly_know_er is offline Fossicker
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    Hmm ok I've spent the last 15 mins researching... so forgive me if I'm way off the mark... Thinking about fibreglass boats not much metal there and they have radios.

    The one in the ebay link is "ground independent"

    and on this page:

    [ame]http://www.gme.net.au/public/pdf/brochures/antenna2_b.pdf[/ame]

    Mounting positions
    An antenna needs a large uniform metal surface
    beneath the radiating elements to perform
    correctly. This is referred to as a ‘ground plane’.
    Therefore the best position to install an antenna
    is in the centre of a metal roof, however, this is
    not always possible and installation on a bull bar
    or mirror mount is often necessary. In this case a
    ‘ground independent’ antenna should be used
    to give the antenna its desired radiating pattern
    without a metal ground plane
    So I think maybe it's not ideal but workable?
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  4. 7th August 2014, 06:47 PM #4
    chopper
    chopper is offline Master
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    It should be right then , and you have successfully answered your own question. I only thought it would be "better" , not compulsory.
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  5. 7th August 2014, 07:34 PM #5
    Don 130's Avatar
    Don 130
    Don 130 is offline ChatterBox Supporter
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    That little plastic cover is not very strong.
    Don.
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  6. 4th September 2014, 05:34 AM #6
    HowardSmall's Avatar
    HowardSmall
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    True. I had an aluminium checker plate made to the same dimensions as the plastic one. It supported a heavy duty spring and 9 foot HF antenna without any problems.

    If you use a gpi antenna it makes no difference being mounted on plastic, in free space or whatever.

    Howard
    Quote Originally Posted by Don 130 View Post
    That little plastic cover is not very strong.
    Don.
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