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Hold on, let me go back here. I took a look at the way I worded my response last night and I apologize. I wasn't really into what I was saying that late last night, so if I can correct myself, the guy said basically the same thing you guys have said, about the ground plane effect. Because of...

Oh yeah, I could mount the whip there, but I just don't want to put holes in the roof. I tried the new setup out and I'm transmitting the distance I wanted to in the first place, so all's good.

I just went to get a new Wilson 5000 (magnetic). The guy who runs the shop has installed mobile units for years. He said any antenna installed on a light bar like mine won't work because the RF will travel down the bar each way. It doesn't matter how many grounds you put on, the interference...

Ok, I finally got my hands on a Wilson 5000 from a friend of mine. I set it in the dead center of my roof (magnetic), and connected its line into my own. Results: High SWR gone! So I've come to the conclusion that somewhere, somehow, the way the truck is layed out, I'm just not getting the...

Yea, I've recalibrated before every check. I'll have to try moving those wires around a bit more, but in twenty years of working with cb radios I've never seen anything like this.

All of it is above the roof line. The coax I'm using on the truck now is RG-8X, so it's 50 ohms, and what I used to the base antenna was RG-213, so I tried substituting RG-213 on my truck and it didn't change anything. I have my hot line from my radio run to the positive post of my battery...

I did take off the spring and try without luck. In fact, I've tried several different types of antennas, not just the steel whip. I've taken the lights off the bar and tried, but it didn't work. I've ran another ground wire with stranded line, instead of solid as well. To be more exact, my...

Well I know I'm having a problem with this antenna and the way it's working with this truck. The SWR is exactly 2 on every channel, regular band. My whip doesn't have any set screws in it, so I can't adjust it up or down, and I shouldn't have to be cutting it any. My truck's bed isn't metal...

Well then I reckon it's fine. I've also checked the coax for shorts, but everything looked good there. I'll just try these other ideas later today and hopefully I can say it's fixed tonight.

Yes, I have the spring mount on it. I was also thinking, and it might be hard to explain here, but where the stud runs up and screws into the bottom of the spring, there is a plastic washer insulating the outside of the spring from grounding out on the light bar. Now in between that washer and...

Well, I haven't measured its exact length, but I haven't done anything to it since I bought it new.

Yea, I'm going to have to do some more experimenting. Thanks for the responses.

Well, it certainly might be the problem, or at least part of it. Now I can say that all of the antenna (except maybe an inch or two of the bottom) is above the lights. Just about 100 inches straight up into the open air. Still, I thought the signal may be radiating down and bouncing off the...

Yes, the base of the antenna comes down in between them. Two on the left, two on the right. I did lay a few thick rubber mats over top of the lights to see if it would help, but it didn't.

I've tried tuning it with no luck. I'm currently using a 5000 watt Astatic meter. Sorry if I wasn't clear, but I am using just one steel whip. I grabbed another one off another truck of mine and tried it, since I know the CB setup on that truck has a low SWR. The meter should be fine, it...

Alright, I've got a 102" steel whip mounted onto a horizontal light bar (also holding four 100 watt floodlights) which is mounted onto a chrome roll bar which is mounted in the bed of my truck. Knowing that the bed is made out of that plastic material, I grounded (with solid copper wire) the...