From an earlier post of mine:
It's my understanding the way this unit works is that it is placed in-line with the FM antenna lead, cutting off the external antenna and sending the iPod (or AUX) signal through the antenna connection when in use. The unit itself replaces the "tray" in the center console. The iPod and AUX connections replace the 12V plug.
So technically it is an FM device, but it does not broadcast over the air - it is hard wired directly to the head unit through the antenna lead. So I guess the best way to answer you is: ,
Still, I believe this means the signal can be no better than a "perfect" FM signal.
I hope this helps!
'08 CS - Meteor Gray, Cocoa, Sport Mode, PASM, Short Shift, Sport Seats, Sport Steering Wheel, GT-3 brake ducts, Bi-Xenon, and a few other goodies.
'90 944 S2 - India Red, Black/Linen
I love these cars!!!