Change your signals from week to week, or use the radio if you must.
(Even with the radio somebody will get a scanner and intercept the in-
coming play.)If you want to stop the other team from knowing the play, lets get oldschool and have a QB who can call his own plays and players versatile
enough to play every down, instead of situational subs. Until the late
80's most QBs called their own plays, with the exception, a la Hank Stram
"32 toss power trap" occaisionally calling a play. I can't believe today's QB's, with the exception of Peyton Manning and the Pats QB Brady, aren't smart enough for play calling. That stops the video recording of signals etc. The game isn't that tough and I think some of these coaches are too smart by half, that they micromanage the game all the way down to play calling.