simple head unit

So I'm just doing some prewiring before I install my girlfriends new radio. Her car is a 2001 Honda Civic sedan (I don't know model, can't remember, she just got it) The unit is a Kenwood KMM-BT308U, and the wiring harness is an e2 86+ honda ( EHA28f)(it's made by scoshe). My question is for the Dark blue wiring on the actual harness, it is labelled as "Power Antenna". I don't know what wire on the head unit it goes to. As far as I know, I have three choices: 1) Don't connect it to anything. I've read that this leads to poor radio signal. 2) Connect it to the Blue/White (Power Control wire). The description says : "to the power control terminal when using the optional power amplifier, or to the antenna control terminal in the vehicle" (this is what I believe is right) 3) Connect it to the Blue wire (Antenna Control wire). Description says: Not used

You can tape it off as it likely isnt'd used. If Kenwood radio has a solid blue wire, you can connect them. The circuit is designed to trigger a power antenna to raise or in some cars it turns on an antenna amplifier module. It only has power when in radio mode. It shuts off with CD or other inputs like USB.sparky