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Author Topic: NMO Roof Mount  (Read 882 times)
NL7ZL
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Posts: 2




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« on: January 07, 2002, 08:22:04 AM »

I am getting ready to install an NMO roof mount on my 1997 Nissan Truck and 1995 Nissan Quest.  What do you use to drill the hole in the roof for the mount?  Any helpfull suggestions on installing this type of mount would be appreciated.

Thanks,

Tom
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WB2WIK
Member

Posts: 20574




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« Reply #1 on: January 07, 2002, 12:23:11 PM »

Don't drill it, punch it.  I wouldn't use any kind of drill to make a hole that large in the roof of my vehicle.  A smaller pilot hole, followed by a metal punch to create the final hole, is the only way to go to minimize risk.

If you don't have a sheet metal punch of the appropriate size available, I'd recommend you drive the vehicle and the mount over to a local 2-way radio shop that installs such antennas routinely, and have them do it.  They'll have the punches required, and won't charge much if you've done the advance preparation work for them (such as removing the headliner, if there is one, or any other work that would need to be done prior to actually mounting the NMO).

73 de Steve, WB2WIK/6
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KC8AXJ
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Posts: 303




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« Reply #2 on: January 07, 2002, 07:35:44 PM »

A good hardware store should carry a 3/4 inch (I think that was the size required that I have) ROUND HOLE SAW. Make sure it is built to cut METAL/STEEL.
I did this to my Durango and it worked slick! A 3/8 drill will run it.
No problems.

73
Steve kc8axj@arrl.net
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INITZERO
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Posts: 102


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« Reply #3 on: January 08, 2002, 03:58:32 PM »

I've put many holes in cars (some even on purpose)
and the punch route is the right way to do it. While
a good hole saw bit can do the job, I think the punch
ends up with a more professional hole.

The punch isn't that much more expensive than the
hole saw. If you can't find one to borrow (check
around your ham club), it wouldn't hurt you too
much to buy one.

Matt (k4mls)
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INITZERO
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Posts: 102


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« Reply #4 on: January 08, 2002, 03:58:35 PM »

I've put many holes in cars (some even on purpose)
and the punch route is the right way to do it. While
a good hole saw bit can do the job, I think the punch
ends up with a more professional hole.

The punch isn't that much more expensive than the
hole saw. If you can't find one to borrow (check
around your ham club), it wouldn't hurt you too
much to buy one.

Matt (k4mls)
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KA0W
Member

Posts: 4




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« Reply #5 on: January 14, 2002, 07:40:10 AM »

I used a hole saw to do my NMO hole in my 98' Frontier. A standard drill would not be my choice, but a hole saw did a neat job.
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KC0IEE
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Posts: 41


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« Reply #6 on: February 20, 2002, 09:57:21 PM »

  Working as a mechanic for a local city, I've drilled LOTS of 3/4" holes for NMO mounts with a Unibit. It's a stepped, straight flute drill bit that makes the quickest, perfectly round hole in sheet metal you've ever seen. They are a little expensive at about $40 but should last a lifetime with proper care and IMHO is the best way to make a hole for an NMO mount.
Most hardware stores stock them in several sizes.

Chris KCØIEE
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