| Do aftermarket headunits have this 'circuity' like you said the bose headunit has? The adapter listed has 3 ends: 1. single-prong male connector from adapter that plugs into single-prong female anntenna connector on the alpine headunit. 2. 2-prong female connector from adapter that plugs into 2-prong mail connector from antenna cable in the car. 3. What's the 3rd connector from the adapter for? The glass-antenna? Where does it plug into - the headunit? Thanks, Paul
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