A lot of hot rod guys use a standard extension antenna and hide it. I've heard of them putting it under the dash, under the headliner, behind a running board, strapped in the trunk below the package tray etc.
I shaved my antenna. I keep thinking about putting one of those wire hidden antennas inside my rear spoiler.
The more you read the more it seems like its a crap shoot based on how far you are and where the signal is coming from...