Need to know where hot wire is when Radio is ON

[cr_thompson]

I have a 2001 Coupe with the factory CD changer cable going to the back of the vehicle. I need to know where the closest wire is that turns on when the radio is ON. This is probably the same wire that controls the power antenna on the convertable. I'm hoping there's one on the CD changer harness cable. Anyone know which wire it is, or the next closest one? Thank you. Chris