gmrs mobile antenna

Joined
Sep 18, 2016
Messages
240
Location
Monterey, CA
#1
hi. my nmo anenna on my car roof top is too tight. i tried to use a wrench (wrong size) and scratch the outside brass part (the black came off).

how do i take it off?

will the scratch cause any issues?

delivers1234
 
Joined
Jul 27, 2005
Messages
9,713
Location
WTVLCA01DS0
#2
The base is likely brass, so it won't rust. It's just a cosmetic issue. You can try touching it up with a black sharpie marker.

You need the correct size wrench or a large enough adjustable wrench. Run by Harbor Freight over in Salinas and pick one up for a few bucks. Or check with your neighbors. Someone is bound to have a wrench big enough to loosen it up.

I usually unscrew my antennas each time I wash my truck. Partially to wash underneath, partially to check for corrosion or any other issue.
 

krokus

Member
Premium Subscriber
Joined
Jun 9, 2006
Messages
3,576
Location
Southeastern Michigan
#3
Brass corrosion can, generally, be broken with a bit of shock loading. (Part of why firefighting appliances are made of brass.)

As mentioned, get a wrench that fits. If it is beyond hand tight, with a properly fitting wrench, some light tapping on the wrench handle should break it loose. (If not, apply some PB Blaster to the threads, let it wick for a few hours, and try again.)

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Joined
Mar 12, 2014
Messages
1,004
#4
I also remove my antennas when washing vehicles. Once you get the antenna off, you may want to consider using a bit of silicone dielectric grease on the base threads. You don't need much, just enough to lightly coat the threads. This should make the antenna easier to remove in the future. As far as the scratch goes, it's mainly a cosmetic issue but a Sharpie or some touch up paint should fix it up just fine. (Be sure to apply paint with it off the vehicle though. I don't want you cursing me if the paints gets spilled on your car ;-)
 
Joined
Dec 22, 2013
Messages
2,733
#5
Too much torque on the frozen nut can distort the sheet metal. Some penetrating oil will help. Be careful of the paint. Careful tapping the nut on all sides will help loosen it up and wick up the oil. If it still does not budge, heat up the nut with a hair dryer all around and it will expand a bit.

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