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Old 05-25-2013, 02:58 PM   #1
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Home Made Ham, CB, Scanner Antenna mount

I just finished making and installing a communication antenna mount on my 2013 Wrangler JK that is neat, requires no holes to be drilled in the vehicle and looks great. Another advantage to this mount is that it elevates the antenna from the metal body structure of the vehicle providing excellent coverage. The mount itself, I made out of T6061 3/16" aluminum plate, this requires some metal processing knowledge and some power tools, however to anyone with a mechanical aptitude should be a snap. The mount screws to the rear of the tower tail on the spare tire holder, it is a metal construction that has a ground to the rear door providing the sought after ground plane required for any communication antenna. This mount hides the coax cable from view and I polished the aluminum as well. Here is 2 pictures to show appearance from behind the vehicle,
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Old 05-25-2013, 04:29 PM   #2
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Doesn't look like it's grounded though. What are your SWR readings?

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Old 05-25-2013, 06:37 PM   #3
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It is grounded, the light tower is metal, the door of the jeep is metal, the door is connected to the body, the body is connected to the frame, it is a complete ground circuit. SWR readings 1.1.
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Old 05-25-2013, 06:39 PM   #4
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Most people believe the tower is plastic, use a magnet test, it's metal, I think a casting but albeit, metal give it a try
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Old 05-25-2013, 06:47 PM   #5
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I might add, I had the very same antenna on a 2008 Impala, solid trick lip mount, worked well but not as well as this
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Old 05-25-2013, 06:51 PM   #6
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If you have concerns about the grounding, you could install a braided copper insulator cable from an 8U cable to anywhere on the hitch
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Old 05-25-2013, 07:24 PM   #7
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Quote:
Originally Posted by JeepMoose View Post
It is grounded, the light tower is metal, the door of the jeep is metal, the door is connected to the body, the body is connected to the frame, it is a complete ground circuit. SWR readings 1.1.
Glad you have a good match, hope it works well for you.

The door does not have a good ground connection to the body. Hinge pins are greased. Put a ohm meter on it, it will not be reading zero.
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Old 05-25-2013, 10:28 PM   #8
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There is a difference between a ground for voltage and a ground for RF. It would probably be a good idea to run a ground braid from the antenna mount to a clean metal ground point on the frame.

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Old 05-26-2013, 07:16 AM   #9
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Thats a good looking mount. From my understanding of antennas that location is about as good as it gets on a JK. I couldn't mount mine that high up and pull off a 3' cb antenna and my garage door, so I went for the less ideal base of the spare tire. I forget what my SWR is, but it works well. Someone pointed out the hinges issue when I installed mine. I ran a 12 gauge grounding wire from my gate mount to a bolt over by the subwoofer. I might go 10 gauge if I was to do it again, but it works fine. The less the resistance the better. It's hard to make a case with a 1.1 SWR though.

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Glad you have a good match, hope it works well for you.

The door does not have a good ground connection to the body. Hinge pins are greased. Put a ohm meter on it, it will not be reading zero.
I made a video how to check a grounding spot to the battery, with an multimeter and some spare wire. If you we're wanting to test, you would probe the metal on the mounts base to the battery.
http://youtu.be/1Rj7CyohK98

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