CB Troubleshooting Help

Today I got rid of my truck spec antenna and bought a Wilson 2000 trucker whip, before I get too far into what I need help with , I have a 2017 international prostar, no external mount for the antenna it’s mounted on the factory mount on top of the mirror. But no need to carry on on that, I’m having a issue with a high pitched static sound when I I try tweaking my squelch I’ve gone out and made sure the antenna is tightened down and also made sure the coax (factory coax) was tightened down along with the wiring harness being wired correctly. After all of this it’s still hitting that static, along with no reading on the swr meter. I’m at a loss so maybe someone else has an idea. And I almost forgot I got a cobra 29ltd classic. Thanks in advance for any advice

 

Well before hand my ant warning light kept lighting up so I got a new antenna thinking that one finally bit the dust but the light still comes on and now has the issue discussed above