Trimming Adjustable Antenna -
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Go Back > General Technical Discussions > Stereos, CB & Ham Radios, GPS, & Electrical. > Trimming Adjustable Antenna

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Unread 05-20-2013, 10:08 AM   #1
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2005 TJ Wrangler 
Join Date: Mar 2009
Location: Brunswick OH
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Trimming Adjustable Antenna

I just finished installing my CB using the Arizona Rocky Road double antenna mount (adding a 2m later) and a Wilson Flex4 antenna. I sanded everything and used dielectric grease on contacts and ran a braided strap from tailgate to tub to make sure everything is well grounded. Somehow my very first attempt at soldering PL259 connectors went well...

I'm getting a 1.3:1 on channel 1, and 1.7:1 on channel 40. I know it should be fine to use it as it, but ideally I want those numbers to match, which I believe means shortening the antenna. But the adjustment on the tip of the antenna is already all the way in. On the Wilson Flex, even when it's all the way in, it's still sticking out the top, so I'm wondering if it's safe to pull the adjuster out, trim the bottom a bit, and stick it back in to essentially shorten the antenna? It would be nice to see a 1.5:1 on both 1 and 40.

CURRENT: '05 TJ Rubicon
Past: '06 TJ SE
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Unread 05-20-2013, 12:31 PM   #2
Real Jeeps have dents
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Run it like it is. You will only be chasing your tail. The difference is extremely minor, about a 3-4% variance.

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Unread 05-23-2013, 10:04 AM   #3
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I trimmed the tip on my Wilson 3' allowed me to get the SWR lower. I just took a little off at a time...
Originally Posted by mrblaine View Post
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Unread 05-23-2013, 11:20 AM   #4
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Be careful here. I was close to 1:1 SWR on low channels and about 1:4 on higher channels. I want it to be better. I worked at and now I at about 1:4 on lower and 1:6 on higher channels. I decided to quit while I was ahead and live with it. They say anything below 2.0 is fine. I was playing around with a magnetic antenna I could put it on the cowl and be just under 2.0 and moving an inch to the hood was closer to 3.0. Even opening and closing doors changes the SWR on my jeep.
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