The shop said the harness that plugged in from the Honda Pilot to the empeg had the power antenna wire in the harness and the tuner is powered that way.

I found this on the net, let me know if this helps. I am getting confused.
I have the blue power antenna wire from the tuner not hooked to anything, but ther tuner is working, just bad reception.

http://www.hondapilot.org/forums/showthread.php?s=&threadid=5037