I remembered what's missing!
(I don't know what all these references to dead horses and German laws are about, maybe some people are a little too quick to jump to conclusions...?)
Anyway, on all the pictures that I was able to check on the 109's, whether they had a tall post for the antenna wire behind the canopy, or the loop antenna, there was a small post on top of the tail, just in front of where the rudder attaches, for the antenna wire to attach to. This seemed to be there whether or not a wire was actually stretched back to it. Maybe it's just the poor resolution on my monitor, but I don't see it.
Anyway, back to the show!