FWIW, the car body is awash with RF from the ignition system, typically 6-8MHz, mostly. For radio, this may not matter. What might matter, though, is where you get your ground reference. The typical antenna connects the whip to the center conductor and the shield to the car chassis ( I am fairly certain). So the car body actually acts as a virtual ground plane. Stop me if I'm wrong. If you did somehow use the body as an antenna, it is also the 0V point in the power supply. What would act as your earth reference? Whatever happened to the antenna embedded into the windshield? I don't recall seeing that since I was a kid. Chris Eddy Pioneer Microsystems, Inc. Quentin wrote: > Speaking of cars. > I've heard somewhere you can use the body (0V) as an antenna, anybody > know how? > How do you isolate the body (or 0V) from the antenna? > > Thanks > > Quentin > "All we sense is vibration, nothing is material."