Hello all, I am new to the Amateur Radio world, and I need some help I have installed a Kenwood TM-271A in my Jeep, I have two direct wires from the batt. one from postive and one ground. When I am NOT TXing or RXing I get interference on almost every channel( more so on the 144-145 fq) I can hear my engie RPM through the interference in the background, but its mostly just a static sound. I also get it with engine OFF ignition on. I am running a simple Larson antenna and about 3-4 feet of cable between antenna and radio any ideas...will a bandpass filter fix this?