20M 1/4 wave vertical antennas... any commercial ones out there?

Discussion in 'The Okie Corral' started by InjuriousGeorge, Jun 4, 2007.

  1. InjuriousGeorge

    InjuriousGeorge

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    Does anyone make a full 1/4 wave 20M vertical antenna with radials for elevated mounting?

    I'm trying to figure out what material to use for a self-supporting 16-1/2 foot radiator and want to get some ideas from a commercial manufacturer's site.

    I tried making an all-wire 1/4 vertical and hoist it up in the trees but my G5RV beats it easily. I think I need more elevation to get above the canopy and clear the ridge line.
     
  2. martho

    martho

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  3. InjuriousGeorge

    InjuriousGeorge

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    Thanks for the link. Those look kind of like what I was thinking, but using 6' telescoping sections of aluminum from Texas Towers for the active element.

    My concern is by the time I get done farting around with the elevated radials I'm using the same footprint as a 5 band hex beam.
     
  4. FN64

    FN64

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    Have you considered a ground mounted vertical with a bunch of radials??
    I had decent results using one at the lake last month. I used 12Ga solid for the vertical inside a 3/4 pvc conduit & "wreath wire" (~~24ga soft ferrous) for the radials.
    The reason for the iron wire is that I can get miles of it & toss it when I'm done...great for experimenting.

    73..FN
     
  5. martho

    martho

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    I don't remember the exact number, but its something like 4 elevated radials are equal to 128 radials on a ground mounted antenna.
     
  6. FN64

    FN64

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    I think 128 is the optimim.. beyond that there's no gain..
    I generally run 20-24 in a "bowtie" configuration & it suits my needs quite well. Of course I'm right on a lake shore as well so theres likely good capacitive coupling to ground.
    ALSO it's miles from other electrical QRM.. something that buries me at home!!

    Lake QTH = N 44.83626 W 67.44606

    FN
     
  7. martho

    martho

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    Another idea here....

    Go to a couple hamfests and buy some old crappy verticals for the base plate and aluminum. Then, make a true 1/4 wave vertical. You only need approx. 16' of vertical radiator. I bet you can easily build it for under $100.

    I have two homebrew 1/4 verts. One is 23' tall for 30m and the other is 33' tall for 40m. I used the plates from the hygain AVT/AVQ series. I buried the radials in the ground with lawn staples and both antennas work excellent.
     
  8. InjuriousGeorge

    InjuriousGeorge

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    Very good idea.

    As an added bonus the look on my wife's face as I start hauling used "treasures" from a hamfest in to the garage will be priceless. :rofl: