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Round antena on roof

Discussion in 'Ford Explorer Police Interceptor Utility PIU' started by Lightn95, February 24, 2018.

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    1. Lightn95

      Lightn95 New Member

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      There is this round hockey puck looking antenna on the roof of my '13 PIU. Im pretty sure it is the cause of my water leak in the rear of the Explorer. Does anyone know how to remove it? I want to seal it better to stop the leak. It turns fairly easily and I can get under it. But I can't get it out.

      Thanks
       
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    3. DubsR13

      DubsR13 New Member

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      Its probably locked from the bottom. I imagine if you remove the headliner you'll see the lock/ be able to confirm the leak.
       
    4. jmr061

      jmr061 Well-Known Member

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      Pics would be helpful.
       
    5. jmr061

      jmr061 Well-Known Member

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      NMO mounts are commonly used for antennas. Go to the 8 minute mark of this video....it may be of some help.

       
    6. kobresia

      kobresia Member

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      What Jason said. They're pretty much all NMO mounts, a small strap-style pipe or oil filter wrench with some purchase will twist it off. Upfitters seem to really crank down on them during installation in hopes they won't leak, and after a few years of the roof getting hot, the o-ring will stick.

      Once you get it removed, your best bet would probably be to get a plug and then coat it with RTV silicone, that's what most decommissioning folks do to patch the roof properly.
       
    7. peterk9

      peterk9 Staff Member Moderator Elite Explorer

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      ....."wrench with some purchase will twist it off." :dunno:
       
    8. kobresia

      kobresia Member

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      Are you wondering about "purchase"? It's the word to describe a leveraging grip against something, and the puck antennae can be very stubborn. I was trying to remove one from my parts vehicle without damaging it over the weekend. Without the correct tools, which I was lacking, it's pretty challenging...
       
    9. peterk9

      peterk9 Staff Member Moderator Elite Explorer

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      Thank you. I've never heard it used in that context.

      Peter
       
    10. Lightn95

      Lightn95 New Member

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      That's exactly what I was planning on doing. So they unscrew off the roof?
       
    11. kobresia

      kobresia Member

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      Pretty much, yes. The NMO mount clamps into the hole in the roof, then the antenna base screws down on it and seals the hole with its o-ring.
       
    12. bluelinebrotha

      bluelinebrotha Member

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      I'll buy the puck off of you!
       
    13. Lightn95

      Lightn95 New Member

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      I'm not sure how big of a hole will be left in my roof. The antenna is about 3" round.

      Do the roofs have 2 skins, or is it just 1 layer? I'm still chasing this roof leak!
       
      Last edited by a moderator: February 28, 2018
    14. kobresia

      kobresia Member

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      They are one layer with ribs. The typical NMO mount hole is 3/4".

      One thing to be aware of, the NMO mounts generally aren't watertight without the antenna or a weather cap, so make sure you have a 3/4" plug and some silicone RTV or caulk handy. The mount itself can usually be angled back into the hole and left in the headliner if you don't feel like pulling it and the length of cable out.
       
    15. Lightn95

      Lightn95 New Member

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      Ok great. Thanks
       

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