[RFI] HF Mobile Installation in 2001 Mazda

[Tim Groat]

The benefit you'll most likely see from running power leads to the battery 
is reduced alternator whine. It isn't likely to affect the car's CPUs, but 
it can make the radio sound bad. This is an audio effect, not RF. The 
alternator produces considerable audio-frequency ripple current, and the 
battery is the shunt filter that reduces that "power supply hum". The 
battery terminals usually are the quietest points in the 12V power system.

73,
--Tim (KR0U)