I think it was of the 3s-2200 caliper.
OK, this is probably overkill but just looks cool. The wire antenna from the front fuse to the port vertical. Hard to get good pics of it. Mounted on a spring inside the canopy area, runs up through a small hollow brass tube( securely mounted!) and then clips on the vertical loop.
Pull tension at the brass tube, stretch back and engage the hook to the loop. When breaking the plane down, simply disengage the hook and pull all the excess back inside the front fuse for storage.