CB Radio Interference

[Storm Chaser]

I ran a pos and neg lead directly to the battery because it is a high power 10/11 meter radio. Ran the leads through a hole in the firewall that I created and underneath the I/P directly behind the diagnostic port. The radio receives and transmits flawlessly. It is a strange type of interference immediately after I disengage the brake. I may try to reroute the wires tomorrow but it sounds like the radio is picking up some type of internal communication from within the vehicle. Thanks. Any more ideas?