I have a 2007 Si Sedan, and I used the power antenna wire that is located near the passenger side rear seat. It's really easy to tap into, just make sure you tap into the right wire. I don't know if this loom is in the same place on the coupes or not.
There is a DIY on here showing pictures and wire coloring, but I can't seem to find it.
You should be able to tap into the power antenna wire. If you have access to a test light you can check to make sure that the wire you want to use is a ,"keyed" wire meaning activated by turning on the the car. If any of that makes sense. But yes the power antenna wire should absolutely work! It looks like the blue wire in your diagram, the one you have marked.
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