I bought a panasonic stereo with bluetooth great radio. But my old stations will not come in all the time like the stock radio did and whenever I go around power lines I get a buzzing noise. The other day I was next to a semi and I could hear the guy on his cb! I had Best Buy remove the radio and put in another one of the same kind and a new antenna. Same problem! Then they put in a different radio a kenwood and the same problem. They have not had this problem before. Has anyone else had this problem or know of a fix?

 

I've done a couple stereo installs, and all I can think of is that possibly you damaged the insulation on the antenna line behind the stereo, or the antenna plug is not properly seated.

Are you listening to AM or FM?

 

A bad ground perhaps?