I've completed my F-350 diesel and FT-857D install. Not too shabby if I do say so myself. Radio is in a compartment under the rear seat. Now...I'm left with what Alan (K0BG) calls injector shuttle noise. I didn't even know I had one! It is as high as S8 and is definitely coming in via the antenna. I walked around the vehicle with my trusty Tecsun PL-880 and it's there. Curiously, in front of the vehicle it is least...but still obvious. If I wanted to pull a 10' trailer behind me and put the antenna on it I'd be all set. The noise "vanishes" at 10-15 feet out. Question: The noise is worst on 80, 40, 30, 20 and diminishes the higher in frequency I go. On ten meters it is barely perceptible. That being the case (VERY broadband ratchet type pulsing; varies with speed), why don't I hear it on the AM band with the vehicle radio??? What do they do that I haven't done? Otherwise, the vehicle produces negligible "other" noise from all the myriad of electronics on board.