You can attatch the power antenna wire coming from the car to the switched power wire (red wire) from the Pioneer. If you do that, the antenna will go up whenever the radio is on, and go down when the radio is off. The only thing is that the antenna will remain up when your listening to a CD. Radio's with power antenna wires will put the antenna down when your playing a CD. If your Pioneer truly has no power antenna wire, this is your only solution. Or you can use the remote lead wire like mikenichol said.