Very pleased with my Larsen NMO2/70SH antenna install

Discussion in 'Mobile Radio' started by AK4PX, Sep 25, 2014.

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  1. AK4PX

    AK4PX Ham Member QRZ Page

    I love the DIY part of this hobby. 2M from the couch was stale and CB held no interest for me.

    So 2M/70cm mobile. (on a different car, to eventually include 10 and 20m).

    I started out with the least compromise possible for 2/70. That meant center roof mount.

    I once had a magnet mount antenna for CB, back when I didn't know any better.

    Now that I do know better I went with the NMO mount and of course staying in Amateur Radio.

    My apprehension was the same as anyone else; "Drill into my car!?!??"


    Once I finally did buy the parts and tools it still took me 5 weeks to build up the courage. "Do I really want to do this?" lol

    Then I just said the heck with it. I messed with the interior trim a bit to see if I could avoid dropping the headliner. It was possible but I would be more comfortable dropping at least the aft section.

    So another three weeks after that I finally decided, again lol, the heck with it.

    So with cloudy skies I pulled out the C-pillar trims pieces, the rubber seals on the doors, and the B-pillar trims to drop the aft portion of the headliner.


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    Earlier on I had criss-crossed some paracord on the roof to give me the center point but it was a bit far back. So this time I just took a cloth tape measure offset back a little from the cross-member, and marked off the center.

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    Took the inexpensive Harbor Freight 3/4in step drill bit and went for it ............

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    I put a dab of Nyogel on the o-ring of the NMO mount and gently snaked it into position from the outside inward, being extremely careful to keep that outer ring connected to the inner portion of the NMO mount, otherwise it would drop into the car and I would have to start over again lol.

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    I then put a dab of Nyogel on the o-ring for the antenna and snugged that down tight as well. At that moment it began raining.

    I swiftly, yet smoothly, ran the rubber seals back into place and closed up the car. Trim and headliner would have to wait lol.

    But once that was over I buttoned everything up, discovered no leaks, and we were good to go.

    SWR is 1.0 at 139.4x and 1.5 at 146.5x. I'll just leave it.

    Here in the flatlands of south Florida I'm able to kerchunk the repeater 40 odd miles away but unable to copy a response. That's using my Icom V8000 VHF gobox at the 75w setting and sitting on the passenger seat.

    Another set up is the HT with a pigtail and hand mic. Less reception on the fringes and simplex but perfectly usable as well off the repeaters.

    That center mount really takes advantage of the resulting ground plane.



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  2. N1VAU

    N1VAU XML Subscriber QRZ Page

    Nicely done!

    I got over the "drill into my car" a long time ago. I will drill an antenna in my vehicle while it still has the temporary plates on it!
    I put an antenna on my XYLs RAV4. I looked up how to remove the headliner with factory instructions and they advised to remove the rear seat first. They estimated the removal and re-installation would take 6 hours.
    Yeah I snaked it w/o removal after locating the airbags.

    You forgot the most interesting part, the 1st time you key the transmitter to see if it deploys the airbags! :rolleyes:
     
  3. KD4MOJ

    KD4MOJ Premium Subscriber QRZ Page

    Nice looking job you did! I got 3 drilled into my trunk of my 2010 Jetta TDI. Going to do my Dodge Ram PU shortly.

    ...DOUG
    KD4MOJ
     
  4. K7KWN

    K7KWN Ham Member QRZ Page

    I did this to my pickup and it works great with no leaks (quite important in the Pacific Northwettest). Glad I did it!
     
  5. KE7AGK

    KE7AGK Ham Member QRZ Page

    I used to be hesitant with my own vehicles, but after having a job where I did it to several hundred vehicles, I now punch holes for NMO mounts and Larson and Laird antennas with no hesitation.
     
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