Power antenna wire question with aftermarket radio install and pac adapter.

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Houston, TX
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2012 CX-9 GT AWD
Hello,

I'm about to install an atoto radio to my 2012 CX-9 non nav with bose.

To do this I got the RP4-MZ11 and the metra 40-HD10 antenna adapter.

On the vehicle side harness of the RP4 there is a blue wire labeled Antenna On input. Is this wire receiving power or supplying power?

On the back of the atoto unit there is also a blue power antenna wire which i guess sends power to the antenna

but on the 40-HD10 I also have a blue wire coming from the rectangular connector which is also requiring the power from the headunit.

How should I wire this? Whats the purpose of the Antenna on input on the car harness side?

Thank you!
 
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