Didn't look in the case book on this one, just winging it (I realize that is a scary thought).
The ball hits the antenna after both players have jousted or blocked it there. If the contact is simultaneous, they have both caused it to hit the antenna. Ball hitting the antenna is dead. Doesn't matter which side the ball falls - go back to last statement - ball is dead.
Now you have to go back and see if contact was simultaneous or if Player A pushed it off Player B to contact the antenna, if so - point to Player A (SD uses rally scoring this year). If contact is so close to being simultaneous - you would have to rule replay as each player caused the ball to hit the antenna.
Now I'm going back to my very first statement that I didn't look this one up, just using common sense (I know that there are some rules/casebook plays that defy common sense), but that is just my opinion on this one.
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