6M Whip antenna for a 3/8"-24 ball mount

Discussion in 'Mobile Radio Systems' started by KC9SGU, Jan 26, 2011.

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  1. KC9SGU

    KC9SGU Ham Member QRZ Page

    Any ideas what i could use for this? i will be using a medium sized spring
  2. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    I use a stainless steel CB whip cut down to 54" overall length. Works great on 6m (for FM).
  3. KI6ZIF

    KI6ZIF Ham Member QRZ Page

    WB2WIK has the best suggestion. The stainless 102" whip cut down would work the best. That is unless you have a height situation, you could use a wound fiberglass one and cut it down as well.
  4. KC9SGU

    KC9SGU Ham Member QRZ Page

    no height situation that i can think of, it likely won't stick up any higher than my larson 2/70 that's mounted on the roof. also, wouldn't it be best to cut it to either 59" or 88.5" for either a 1/4 wave or 3/8 wave?
    Last edited: Jan 26, 2011
  5. K9STH

    K9STH Platinum Subscriber Platinum Subscriber QRZ Page


    Around 54 inches IS a quarter-wave for 52.525 MHz. If he wants to use it for the low end then about 56 inches would be a quarter-wave.

    Depending on the actual mount, the whip may have to be a little bit shorter for lowest SWR.

    Using a 3/8th wavelength might get "tricky" matching it to 50 ohm coaxial cable.

    An antenna 59 inches long for a quarter-wave would be resonant at about 47.6 MHz.

    Glen, K9STH
  6. K0BG

    K0BG Ham Member QRZ Page

    Funny, no one mentioned a loop! If you're going to operate SSB, it is the way to go!

    I'm set up, where in I can switch between a 6 M vertical, and the M2 loop. About 90% of the time, the difference is greater than 20 dB, and when the band is marginal, the loop wins hands down! You can indeed mount it on a ballmount, but it better be a big one, like an old GE Master ballmount made of cast iron!
  7. KC9SGU

    KC9SGU Ham Member QRZ Page

    nice to see you on here Alan, i'm a regular on your site since getting my license, mostly to make sure i don't have too many issues with my mobile setup
  8. K9STH

    K9STH Platinum Subscriber Platinum Subscriber QRZ Page


    A "loop", or as they have been called for decades when used mobile, a "halo" or "squalo" work fine for SSB. But, if for FM, then the antenna needs to be vertically polarized. Also, for line of sight and most tropo activity, for SSB horizontally polarization works best. But, for any kind of "skip", polarization of the antenna doesn't usually have much effect since the polarization of the signal is usually "skewed"

    Glen, K9STH
  9. K9ZMD

    K9ZMD Premium Subscriber QRZ Page

    And keep in mind that the height of your ball mount & spring is part of the overall antenna length; trim the whip shorter, accordingly.
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