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A cars radio antenna wire is unplugged from the radio and then plugged into the Adapter and the the Adapter has an antenna pigtail wire that plugs back into the car radio. The adapter is activated/powered by the SiriusXM - Radio that it is hooked to. If the SiriusXM radio is on, the power to the Adapter is on and it is functioning. If the SiriumXM Radio is turned off the Adapter is also off.
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