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I would try a Metra 44-UA200 before the C6 setup that would most likely cost way more unless you pull one out at a junkyard.
Only one coax goes to the radio, the other goes to the second module box.
The enable signal is 12v.
I never read a definite post for the FM composite signal, but my guess is that the radio varies it from 0-5v depending on the strength of the station it's on. If you do this mod you should be fine with 5v, but only have it on with FM.
looking at a couple C6 set-ups from eBay Etc.. I currently have a power antenna mast, I can keep it and use the toggle switch to turn it on and off, but I miss the older radios that had a separate control for both amps and radio. I have an Android headunit which I do like..
C6 OEM Antenna???
