Cobra 29 ltd receiving question

The radio is a 29 ltd. tuned up but hasnt been used in several years. I installed yesterday and calibrated. Worked fine transmitting and reveiving while truck wasnt moving. Once I start driving Its like I turned the rf gain all the way down and squelch up (even though I have touched neither one) It comes in and out but stays mostly out, could the rf gain control be broken? Whats best way to check?

 

Thats what I thought but the antenna has no visible break and works with other radios

 

I'm going to look at it again this evening, but I checked all connections yesterday. I swear I think the RF gain know is broke or loose on the inside, but I'm not brave enough take it apart and wouldn't know what to do when I got it apart.

 

The radio has talkback installed, it replaced the delta tune know, could that have anything to do with the receiving issue?