I did something similar for a while... It's just that the '1 minute'
setup ended up taking too long when I'm trying to get in and out of
the car tofrom work....

I didn't want to leave the stuff in the car for security reasons and
the window antenna mis-shaped the rubber gasket on my window.... RF
Noise also got worse when my alternator was replaced. I now have a new
car --- and don't want to ruin the gasket or scratch the car with a
magnet mount....

Unfortunately, with a Mazda 6, I can't even use the Sony car SW radio,
since it doesn't have a standard faceplate to place the radio in...
we're all still waiting... I keep on checking mazda6club.com... So,
for now, I have my PocketPC syncing with Internet audio at home and I
listen to the newscast in the car about an hour after it originally
happnened... IT doesn't help for the way home, though (well, some
broadcasters, from WRN, are available via cellphone on the Mobile
Broadcast Network (http://www.mymbn.com))

Actually, Interestingly, the Mazda 6 has an undocumented S meter.
"Turn your radio on (AM or FM), press and hold the "On-Off-Volume"
button and simultaneously press the "Preset 2" button. Presto! Signal
strength meter. Turn radio off to leave test mode."
http://www.mazda6club.com/forums/read.php?TID=9688