Great build! This is one of my favorite kits, it holds up well, and your weathering job really does it justice!
As for the aerial, when I built one a couple of years ago, I used stretched sprue. I also use invisible thread, the very fine nylon thread. You could use fine wire, or fishing line.
I like using sprue in this application, since I'm bonding styrene to styrene.
For the P-47, I also added the attachment point at the top of the leading edge of the vertical stabilizer. On the 1:1 subject, there is a small flange mounted there, with a hole to accept the hook at the one end of the aerial. The aerial also had a small spring, to allow for some stretching, but I didn't reproduce that. I used a small drill bit chucked into a pin vise to drill a hole in the stab, then glued a piece of sprue filed flat in that hole. Then I stretched some clear sprue, and cut a piece to length to fit between the flange on the stabilizer and the radio mast. It was just a matter of using the same glue I used to assemble the model, to attach the aerial. I glued the sprue first to the flange, let the glue set overnight, then attached the other end to the mast the next day. I chose clear sprue, because it looked like wire, without having to paint it.
I look forward to seeing your next project!