Static on cobra 29lx

Ground loop isolator would be the easy way. ( kinda cheating )
Only good for 12 amps but fine for your radio.

https://www.amazon.com/Pyramid-NS12-InLine-Noise-Suppressor/dp/B0007V5X4U

 

Ok here is what I think may be an issue.

Your coax.

Now if you go back to the k0bg site, you look at the section above the common mode currents, it will describe to you how to use a choke to eliminate that issue.

Here is the link.

Www.k0bg.com/common.html

If you want to know why, read the rfi part of the page.

 

@chriskc did you try removing the long ground wire from mount to frame?

A few pages back cwspook listed a sight that has a wealth of info about mobile antenna systems. k0bg. Its a ham sight, but purtains to all mobile setups. Alot of info on bonding with ground straps, and rfi, among other things...give it a read.

But also, sometimes there is just noise that we cant do anything about. Im not sure of the issue your having, but modern trucks arent made with radio equipment in mind... E-this and E-that, lack of ground etc etc...yada yada yada
But keep asking questions. There are some sharp guys on this forum willing to help.

Edit: I just saw that ridgeline posted that sight also

 

https://www.walmart.com/ip/Boss-Aud...43778&wl11=online&wl12=28875652&wl13=&veh=sem

 

I run 2 stereo amplifiers in my truck, one for my subs and other for highs. If I have CB on just where there is no noise, if I turn on my stereo, I get an increased of noise thru the CB. I either turn the squelch up more or turn off the stereo.