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Thread: VHF/UHF inverted ground plane antenna question?

  1. #1

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    Question VHF/UHF inverted ground plane antenna question?

    What affect is there from an inverted ground plane VHF/UHF antenna?

  2. #2
    Super Moderator 5B4AJB's Avatar
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    Hopefully a lower radiation angle, which is why we love verticals...

  3. #3

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    Quote Originally Posted by snakyjake View Post
    What affect is there from an inverted ground plane VHF/UHF antenna?
    What do mean by "inverted" ? When I think inverted, I think upside down but the picture you show is right side up.

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    GTGallop's Avatar
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    Quote Originally Posted by KC8AON View Post
    What do mean by "inverted" ? When I think inverted, I think upside down but the picture you show is right side up.
    Exactly why I didn't pipe up and answer the question. Not sure I even understand what SnakyJake is going after here?
    KG7NDC

  5. #5

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    Perhaps my term is incorrect when I say inverted/downward ground plane...


    This ("inverted" or "downward"):



    Versus ("flat"):

  6. #6
    Super Moderator pmh's Avatar
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    The purpose of the ground plane on the aerial you show is to make the impedance 50 ohms.

    The impedance can be adjusted by changing the length, and or, angle.

    Flat or angled shouldn't affect the radiation pattern of the aerial itself.

    Kind regards,



    Phil

  7. #7

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    And it deters birds, who don't like shiny sloping 'branches'.

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