Tuning Center load Antenna

I just googled it and it looks like a copy of a Wilson 2000. I would take the spring out and see where the SWR goes. I wouldn't think you'd need a spring.

Or better yet, take it to a CB shop that has an antenna analyzer and have them tune it.

 

Spring length will affect SWR but not always in direct proportion. If your swr is moving in the right direction remove a bit less at a time so you don't take off to much. The antenna moving back and forth with the spring may affect your swr when you are riding.

 

Lengthening or shortening the shaft of the antenna should have minimal effect on the tune of the antenna. Here is a prime example. After adding a 4ft shaft to the bottom of this antenna I only had to subtract an inch of stinger. If adding a 3 inch Spring to the bottom of your antenna makes a drastic difference in SWR, then you got other issues that need to be looked at like your mounting location on the vehicle itself, or possibly ground problems.

I'd be curious to see a picture of this "Center load" antenna since very few people actually make such a thing.

 

I've been seeing a few around lately. Mostly on 4 wheelers though. Talked to a guy in a Dodge truck last week for a good while and since i wasnt in any hurry we started opening distance between us. He was clear as a bell at 12 miles when he exited and i held him for another 5 minutes or so after.

 

No Micky D's drive thru breakfast with that truck, Im guessing it works pretty good.

 

Personally I think it's kind of ridiculous for the roof of that truck but it was actually made for a Cascadia or T600

 

Sure dont have much margin of error for hitting things, at least with a Wilson mag mount if something is hit the whip wont break, it may get a slight bend ( happened to me when I hit a low tree limb) but it wont damage coil.

 

I wouldn't worry about margins of error on a tractor-trailer with a heavy duty mounting bracket on heavy duty mirror arms with an antenna with a flexible shaft, but I would definitely worry about it on a $65,000 pickup truck with a tall top-heavy antenna mounted on thin sheet metal on the roof.

 

What are those 5 inch stacks for a cummins?

Isn't that a joke?