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Old 12-21-2015, 06:52 PM
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CB Antenna install - help

Ok I can not seem to figure out what I need to connect my firestik antenna to the coax coming out of my cobra 75. The coax has a large male screw in connector and the firestik has a small coax screw in coax connector. Even RadioShack was useless. Help!

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Old 12-21-2015, 06:57 PM   #2
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Old 12-21-2015, 07:38 PM   #3
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Originally Posted by coolhand129 View Post
Ok I can not seem to figure out what I need to connect my firestik antenna to the coax coming out of my cobra 75. The coax has a large male screw in connector and the firestik has a small coax screw in coax connector. Even RadioShack was useless. Help!
We'll need photos of the connectors for the best help.

Is your mount set up like this? What model Firestik antenna do you have?

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Old 12-25-2015, 04:53 PM
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That's it. I have a 5 ft firestik 2 and I just got the firestik mount. So now I have it all installed on the rear of my jeep but the SWR meter is registering over 3. So now I have another problem to solve. Ugh!
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Old 12-25-2015, 05:16 PM   #5
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Make sure the insulated shoulder washer, shown below, is installed properly. If that insulator is missing or in the wrong position, you'll get an SWR that is over 3 since that washer is what prevents the antenna from shorting to ground.

Also make darned sure the mount has a bare metal to bare metal connection to where it's bolted to the tub, and grind the powder coating away from around the bottom of the hole the antenna mounts through, as indicated by the red arrows. Leave the powder coating on top and inside the hole, just grind a circle of it away from the bottom where the SO239 touches the bottom of the mount.
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Old 12-26-2015, 05:45 PM
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Thank you Jerry. I'll try that tomorrow and let you know how that works. Appreciate you taking the time to explain this happy holidays!
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Old 01-20-2016, 07:43 PM
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Thank you Jerry. You were correct the hole in the mount (on the Ace Engineering Pro rear bumper) is drilled too small and allows the mount to short. The solution was to drill out the whole to the next size 3/8 I think. This allows the nylon washer to seat properly (it has a inner lip that drops into the whole) and center the antenna through the hole without shorting it out. SWR reading at 1.1 now. Night and day better.
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Old 01-20-2016, 07:53 PM   #8
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It's clear some yahoo at Ace Engineering didn't know the antenna stud needs clearance around it. Glad you figured it out!
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Old 01-21-2016, 03:41 PM   #9
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Thank you Jerry. You were correct the hole in the mount (on the Ace Engineering Pro rear bumper) is drilled too small and allows the mount to short. The solution was to drill out the whole to the next size 3/8 I think. This allows the nylon washer to seat properly (it has a inner lip that drops into the whole) and center the antenna through the hole without shorting it out. SWR reading at 1.1 now. Night and day better.
I noticed this and did the exact same thing with mine. Also ran an external ground to the tub as i wasn't getting continuity. SWR is 1.6 now. Not perfect but good enough for my use. I also wrapped the threaded stud in teflon tape, just in case.
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Old 01-21-2016, 04:11 PM   #10
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I had the same problem with the Ace Engineering bumper. As a newbie to CB's, it was really maddening to figure out. But I did eventually, and put some electrical tape around the mount to insulate it from the carrier. That worked.

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