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"Antenna grounding

Discussion in 'Electronic Repair' started by [email protected], Jan 18, 2005.

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  1. Guest

    I am installing two ham antennas on my chimney. What is the best way to
    ground them? DO they need grounding?
  2. What kind of antennas?
  3. Guest

    I have yet to build them but I was thinking a j pole or ground plane on
    top of a short section of mast and a 440 yagi toward the bottom of the
    mast. The mast would be attached to my chimney.
  4. Jerry G.

    Jerry G. Guest

    Many years ago, I was working on TV antenna installations, and use to sell
    the parts for them. We did a fair number of communications antenna
    installations, and a few armature radio antennas as well.

    For safety sakes you definitely need a good ground. You should ground the
    mast of the antenna. The ground will reduce the effect that a near by
    lightning strike can have on damaging your home. Every year there are fires
    from antennas being struck by lightning.

    You must use a proper electrical ground for the antenna. You can use the
    same ground as the electrical entry to your home is using.

    For the wire gauge, a gauge AWG 12 is very standard for this type of thing.
    Many of the antenna installers are using a metal ground strapping that is
    standard for TV antenna installations. If you want the best, copper wire
    would be a good choice. Just make sure that the wire is properly
    screw-clamped on to the antenna mast. On the large antenna installations we
    used to use 2 ground runs from the mast. It was doubled up.

    You should also look in to safety ground decoulper for your line feed going
    to the receiver. If there is a strike to the antenna that may damage the
    front end via the signal cable, this type of protection adds to the chance
    of saving the receiver from having damage.

    The antenna, ground wire, and lead-ins, should be inspected at least once a
    year, in case any repairs are required. It is most important that the
    safety ground is intact.

    The Armature Radio Handbook, and the ARRL Antenna Handbook, should have a
    lot of very good information about antenna installations.


    Jerry G.

    I am installing two ham antennas on my chimney. What is the best way to
    ground them? DO they need grounding?
  5. Yes, as they could be hit with lightning.
  6. jakdedert

    jakdedert Guest

    ....another question from a ham who should--IMHO--already know the answer.
    What's up with that? In any case, despite the inexact wording of the OP,
    yes the MAST--not the antenna itself--should indeed be grounded. I make the
    distinction because this is the kind of question which would be covered in
    any elementary radio text (which I presumed one should have already studied
    in order to 'become' a ham).

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