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mobile beam & flat side antennas

Discussion in 'CB Antennas' started by radioreddz, Jun 26, 2007.

  1. radioreddz

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    W9WDX Amateur Radio Club Member

    Nov 20, 2005
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    has anybody tried the so called mobile flatside beam antennas or horizontal mobile antennas. there are antennas like stargunn beams with horizontal polarization and i see now even preditor 10K even makes a flat side antenna as well as the al cappons and bad wiskies. are these snake oil or is there method to the madness :?:


  2. W5LZ

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    Crotchety Old Bastard

    Apr 8, 2005
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    Most of the so called 'flat-side' or horizontal mobile antennas aren't actually horizontally polarized. And quite frankly, why bother? If a horizontal antenna is mounted as low as almost any mobile antenna, it has no directivity to speak of, and has a radiation pattern not all that much different from a fairly short mobile antenna. I wouldn't count on that "over the horizon" thingy as much as I would a vertical's ability to get 'over the horizon'. What would be the point of using a horizontal antenna as a base antenna is it's only something like 5 - 9 feet off the ground?
    An antenna's polarity is a matter of how the thing is physically arranged. If it's mostly up and down it's probably vertically polarized. If it's mostly 'laying down' then it's horizontally polarized (lay that groundplane antenna over on it's side and you just changed polarity). If the 'other side' of that mobile antenna is the vehicle it's mounted on, and if it extends above that vehicle, it's vertically polarized. If you want to make it horizontally polarized then the vehicle isn't part of the antenna at all, or the antenna sticks out away from the front/back or sides of the vehicle (not at 45 degrees, but at about 70 degrees AND less). Draw your own conclusions.
    - 'Doc
    Sonar likes this.
  3. rfoverlord

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    guardian of freedom

    Jun 1, 2005
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    mobile beam for 11mtr. is a joke even the stargunn beam is more of a (is) "sucker born everyday" beam, save your money stick with as close as you can get to 1/4 wave.

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