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Base 1/2 wave horizontal dipole question

Discussion in 'CB Antennas' started by S&W357, Jan 28, 2020.

  1. S&W357

    S&W357 WDX-556 / 2NC357 Supporting Member

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    I have a 1/2 wave horizontal dipole I put up about two years ago...works great.

    I'm getting ready to put up a second one in another spot to radiate North & South. This one gives me some opportunities regarding mounting points.. Crude pencil drawing below hopefully explains that. :barefoot:

    I would like to have the feed point with balun attached to the center 20' fiberglass pole (already in place) so that the coax would go straight down the pole from the mounting point. One end of hanging cord will be attached to a tree at 20'. The other end I can easily attach to another 20' pole.

    Entire dipole array will be at 20' elevation level from the ground from one end to the other. But...looking at the wire from top or bottom it will not be a straight 180*. It will have an angle in it somewhere around 150* to 160*

    What problem might I expect from this.? SWR? One side of antenna more directional than the other? Anything else?

    Thanks!

    As it would appear from the top looking down




    upload_2020-1-28_13-7-15.jpeg

    Thanks!

    WDX-556
     
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  2. xm49north7

    xm49north7 Well-Known Member

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    I do not think that small amount of bend will show up at all, in theory it will work a tiny bit better off the mouth of the v, but I do not think it would amount to much on that slight of a bend.
     
  3. Riverman

    Riverman Part-time Member

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    I had an inverted V that looked just like your drawing (one leg kicked in about 30 degrees). SWR and performance were unaffected as far as I could tell. (y)
     
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  4. SIX-SHOOTER

    SIX-SHOOTER Sr. Member

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    An Inverted V will talk in a 360 degree circle & takes away the need for Two dipoles. Are you running the wires as a Flat Top & not as an inverted V? If so what do you see as the advantage or disadvantages of the other configuration?

    SIX-SHOOTER
     
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  5. S&W357

    S&W357 WDX-556 / 2NC357 Supporting Member

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    Thanks for the info guys!

    Yes I’m going to mount it as a Flat Top. I’ve had one up as an inverted V before and liked it fine. Seemed to be more omnidirectional and that was OK too.

    Flat Top seems more directional and that’s what I’m looking for. My other horizontal set up for E/W. This one will be for N/S.
     
  6. S&W357

    S&W357 WDX-556 / 2NC357 Supporting Member

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    I do have a vertical antenna as well.
     
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  7. WECSOG

    WECSOG Well-Known Member

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    I think it will be slightly more directional towards the outside (away from the "fishmouth"). It will also likely be a slightly better match as in closer to 50 ohms. In my opinion.
     
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  8. wavrider

    wavrider W9WDX Amateur Radio Club Member

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    Put it up and use it, you will be hard pressed to notice much if any difference in performance with the slight slant you have.
     
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  9. S&W357

    S&W357 WDX-556 / 2NC357 Supporting Member

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    Thanks everyone (y)
     
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  10. 357magnum

    357magnum Sr. Member

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    See Ralph , I told you so ! :LOL: Put it up & run that At-6666 ! (y):)
     
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  11. BJ radionut

    BJ radionut Supporting Member and 6m addict

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  12. BJ radionut

    BJ radionut Supporting Member and 6m addict

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    :whistle:(y):ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:
     
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  13. BJ radionut

    BJ radionut Supporting Member and 6m addict

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    :whistle:(y):ROFLMAO::ROFLMAO::ROFLMAO:
     
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  14. S&W357

    S&W357 WDX-556 / 2NC357 Supporting Member

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    Lots of good info BJ radionut...thanks!
     
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  15. kk4obi

    kk4obi New Member

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    There is no mention of frequency which has everything to do with radiation pattern by elevation.

    I think you are picturing the classic figure-8 pattern so of course, two dipoles at 90 degrees would give better coverage... but only around a half-wave high.

    At 20 feet high 15 meters is directional, 20 meters is slightly directional, 40 meters is circular with a teensy bit of directionality.

    Here is a set of elevation radiation patterns for all the bands.

    www.qsl.net/kk4obi/Elev%20Effects%20on%20Rad%20Pattern.html
     
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