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Lightning Antennas GR45 mobile

Discussion in 'CB Antennas' started by Redbeard U812, Jan 20, 2020.

  1. Redbeard U812

    Redbeard U812 WDX-1030 / U812 South Texas

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    Anyone have one? Are they any good?
    https://www.lightningantennas.com/mobile
    Wanting compact horz. for 11m.


     
    Slowmover likes this.

  2. Highway Man

    Highway Man Well-Known Member

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    with what I have read about antennas the cap hat is to close to the coil for it to be right.
     
    midnight special likes this.
  3. Redbeard U812

    Redbeard U812 WDX-1030 / U812 South Texas

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    Just read through Marconi data, saw the same. Data was in a post about a Zing Ring. Comparing cost of building 2 element cubical quad to buying. Cost effective is the Sirio 27-4 for horz.

    Just the spreaders will cost $107, build the spider, fiddle, file, tune, etc. Building is fun, but lack the time, weather permitting.
     
  4. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Highway Man, this is not a big deal. I just have a different opinion. That's why I did the real world test and later compared these two radiators using modeling over a controllable GP as well. I did not see any detectable differences.

    U812, If I misunderstood you words...I apologize.

    I never tested my GR45 on a car/truck. IMO the GR45 mobile antenna is as good as a 102" whip in match, gain, and maximum TOA. However, if we compare the horizontal gain for these two...it shows about 50% more horizontal gain (where the GR45 shows horizontal gain equals - 50 dbi gain vs. the whip with - 99 dbi gain.

    I doubt we could detect the horizontal signal from either antenna just using our radio...but it is true that the GR45 model shows more horizontal RF than the whip, but according to my models, both 1/4 wave radiators show negative horizontal gain.
     
    #4 Marconi, Jan 20, 2020
    Last edited: Jan 20, 2020
    Slowmover likes this.
  5. Redbeard U812

    Redbeard U812 WDX-1030 / U812 South Texas

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    Have a 102 GP up 37'. Three radials. Home built, call it a StarBuster. Modeled it off a StarDuster, actually started with the hub from original SD. Broke that. All parts were scrap aluminum tubing, top element broke. Took a 102 whip with HD spring and replaced. Works great...1.0 to 1.2 swr.

    Wanting to have horz. The 2 element cubical quad with boomless spider is what I'd prefer to build. Mapped the specs, and dims. In a file on computer.

    Saw the GR45 and it seems to have less wind resistance. I'm on the Gulf and wind here north of Corpus will cause havoc. Being a fulltimer in camper the GR45 could be portable enough.

    The price of GR45 is less than I can build a 2 element CQ, and less resistance.
     
    Slowmover likes this.
  6. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    U812, I sent you a personal message (conversation).
     
  7. Slowmover

    Slowmover Sr. Member

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    Sorry. Restricted to the cool kids.

    I’ve had one over twenty years. The big man at SE told me it was designed to go on a sedan trunk panel (ahead of lid). Body protected from the volume of wind, but with the hat well above the roof (it’s a tall antenna, top heavy despite light weight).

    Had mine on this:
    701E3AC6-A1A2-4F87-AD3D-DEB13E531FEE.jpeg

    The initial steps are via Stargun Certification Points. Earn one per three SG attachment or fastener purchases. After which the portal for GoldenRod approval will appear.

    It’s fun. It’s weird. It’s a talker. It’s a huge windload mobile at 65-mph while roof center.

    See other threads.

    .
     
    #7 Slowmover, Jan 20, 2020
    Last edited: Jan 20, 2020
    Marconi and Redbeard U812 like this.
  8. Mustang 131

    Mustang 131 Sr. Member

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    A great but very fragile antenna. It didnt last long, but about as good as a 102" wip.
     
    Marconi likes this.
  9. RT431

    RT431 In the swamp

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    It looks like a good antenna, as good as
    the102, soI've read on several websites,
    but I wouldnt want to hit a tree limb with
    it.
     
  10. Dmans

    Dmans Sr. Member

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    At 56" (vs. 102"), maybe the chances of hitting a tree limb are reduced by 50%???
    Food for thought!

    73
    David
     
    Woody-202, RT431 and 2NC995 like this.
  11. RT431

    RT431 In the swamp

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    Didn't realize it that much shorter than the whip. Guess I should have read all the specs. :ROFLMAO:
     
  12. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    RT431, I think the older GR45 had a Top Hat that was probably close to 50% of the 1/4 wave length. I think they now have a new version that is longer with a smaller top hat.

    That is what real top hats do...allow the antenna radiator to be notably shorter. Those with small top hats still make the radiator a little shorter, but no where neat 50%. Some claim these smaller Top Hats help minimize static and lightening.

    The original Astro Plane had a <>50% Top Hat and that antenna worked great if installed correctly.
     
    Woody-202 and RT431 like this.
  13. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    SlowMo is right, I don't think the GR45 would be a good antenna on the roof of a mobile. Maybe if it was on the trunk of and old sedan with a trunk lid that was slanted down in the back.

    [​IMG]
     
    RT431 likes this.
  14. Redbeard U812

    Redbeard U812 WDX-1030 / U812 South Texas

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    After doing some reading, I still know the GR45 is not as good as my 102". Wouldn't dare put that on my truck.

    Compact with some ground planes added might be useful for base type horz antenna. Lighting claims horz polarization. But just not enough gain nor the rejection of a 2 element cubical quad.
     
    Slowmover likes this.
  15. Highway Man

    Highway Man Well-Known Member

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    this is were i referenced my information from I believe

    http://www.k0bg.com/caphats.html

    I can't add anything past this other than it's working well in those videogates on the tube
     

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