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This is only used if your vehicle has a motorized antenna that pops up only when the radio is on, then retracts when the radio is off. A voltage is sent from the stereo through this wire to a relay which applied power to the antenna. If you don't need it the wire from the stereo should be capped off to prevent a short occurring if it were to ground out under the dash somehow.

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Q: What is a power antenna wire on a car stereo?
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