Installed new CB & antenna on my new 09, works great except when going under or getting around power lines. The CB will break squelch, and cannot be adjusted out, even at the max setting of 20. When you move away from the power lines it goes back to normal. It don't happen at early power line crossing or at all times when running parallel to them but it does occur quite often. I had an 04 and never had this problem. Any suggestions?