Originally Posted by Beaverboy
There's no reason passive antennas can't work in cars just like they did 10 years ago when analog cellphones were weak.
Actually, modern phones will perform worse than the old analog units. The old "brick" cell phones broadcast at 3W. The newer digital units broadcast at .6w. The reason why the signal is clearer is because the cell phone uses a digital signal, and is far smarter about choosing a clear frequency that the old analog stuff. You can get boosters that will boost the signal of your cell phone to 3W which is the max a cellphone can broadcast at, according to the FCC, I think.