The antenna (for both the satellite and standard radio) in the back of your stock headunit.. (see BCH's photos in the gallery) are an SMB connector type versus the old school plug type with the long prong. You'll need an adapter unless your new headunit comes with a euro adapter.
If you are talking about the ACC wire on an aftermarket head unit, I used the hot wire that comes off the 12volt plug, just sliced into it. It switches on and off the same way the radio does, on with the key, off when you open the door. Hope this helps.
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