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Zerofive 6-20 ground plane vertical?

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by N4JAP, Sep 25, 2013.

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  1. N4JAP

    N4JAP Ham Member QRZ Page

    Im looking for a good vertical solution for 20-10 meters. Already have 80 M OCF inverted V, but want better DX performance for higher bands. I would like to mount such a vertical up high, 20-30 feet. Zerofive offers a 6-20 meter ground plane, using a 19 foot radiator with six, 100" radials. This antenna uses a UNUN and requires a 100+ length of coax. Anyone have experience with this type of antenna?
    I have two requirements: vertical must be elevated, and be as efficient as possible.
    Is there a better, more efficient option? Are Zerofive groundplane antennas using UNUNs and long coax runs worth the effort and money?
    Thanks,
    John
    N4JAP
     
  2. N4JAP

    N4JAP Ham Member QRZ Page

    I take it the lack of response means this isn't a good antenna, or at least not much talked about.
    Cheers,
    John
    N4JAP
     
  3. W1VT

    W1VT Ham Member QRZ Page

    You can get more efficiency by having an antenna tuner mounted directly at the feedpoint of the vertical.

    Zack W1VT
     
  4. KA0HCP

    KA0HCP XML Subscriber QRZ Page

    No antenna 'requires' any particular length of coax. The only reason a mfg would say so, is to use it to damp high impedance through losses in a long coax. Good engineering practice is to use the shortest length needed to reach the radio. :)
     
  5. K4SAV

    K4SAV Ham Member QRZ Page

    Maybe because no one knows what the antenna is. It's not listed on the Zerofive website. Google found a reference to it on the Zerofive website but when you click on it you get an "access denied" message.
     
  6. W9GB

    W9GB Ham Member QRZ Page

    A used Cushcraft R-5 half-wavelength HF vertical (20, 17, 15, 12, and 10 meters) would be a good choice.
    Four counterpoise/radial (48" long) with black matching box (static drain choke, 1:4 unun and choke balun).
    Regularly found used for ~ $150 or less.
    http://www.cushcraftamateur.com/pdffiles/r5.pdf

    Cushcraft_R-5.jpg
    You can mount on a house roof using a heavy-duty TV tripod or Glen-Martin roof-tower and a 1-1/2 inch aluminum mast.
    http://glenmartin.com/category/amateur-radio-ham-radio-towers-for-antennas/roof-top-towers

    The Zero-Five antennas are manufactured and assembled in southern Chicago suburbs by Tom, A9KW
    http://www.zerofive-antennas.com/
     
    Last edited: Sep 29, 2013
  7. KH6AQ

    KH6AQ Ham Member QRZ Page

    I believe you are referring to the 40-10 meter ZeroFive ground plane. It is the equivalent of a the popular 43' vertical. That is, it is an untuned antenna that uses excessive coax loss to allow a tuner at the shack to work.

    It meets your requirement that the antenna be elevated but it does not meet your criterion of efficient. Hy-Gain, GAP, MFJ and others have suitable antennas.
     
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