That would do nothing. The "target" has to be in contact with both the hot wire and ground. That is why birds can sit on the electric wires and not get fried.
Ah rats! and here I was looking forward to seeing it. I think I'm going to set up a feeding station for crows around my big Pecan trees. I've got two of them, over looking the run from two corners. If I can get a murder to set up house, that would keep the redtails away.