Is the diagram above, how your original radio was wired? If so, you could run a fused wire from the driver’s side fuse panel under the dash that is marked "ign". This means, you would have 12V power when the ignition switch is turned on. If you connect that wire to the green wire, the antenna would raise when you turn on the ignition and lower when you turn off the ign switch. Someone else may have a better idea on how to do this, however this is better than the manual method.
