Alright ill try those and get back to you tomorrow on if that was the problem.
Ive read places that it could be mic feedback and that would make sense that the antenna is radiating it back at me.
Thanks for the tips

This question isnt about hams but since it is about radios i figured this is a good place to start.
I have my grandpas CB in my car right now (Uniden Bearcat PC68XL) and when i transmit most of the time all people hear from me is a squeal. Im hoping to fix this because its irritating to me knowing i cant be understood and annoying to people who hear it. Ive tried other mics so thats not the problem but heres some info on how its hooked up.

Power run from a 10 amp turn signal fuse and grounded to a screw on the fuse box (I think this is the problem and am planning on running it to battery)
Antenna is a cobra HG-A1000 21 inch base loaded whip stuck in the center of my trunk.

Any info or advice would be awsome!

Im looking to get this antenna when i get my mobile setup. But there is little info on it. Has anybody ever used it before? If so, how does it compare to other 1/4 wave antennas?