Like an idiot, I threw away the runner that had the alternate antenna still attached. I used the Unicorn antenna to get the shape right and then just mirrored it. I used high quality reference images to model the “face” side of the antenna but it is by no means perfect. I feel that it is nevertheless very convincing regardless. May require a bit of filing to fit, it's very snug.
The author marked this model as their own original creation.