Anti-helicopter mines are currently in use by bulgarian armed forces, they are simple directional shrapnel mines with a proximity fuse, such devices could be used for helicopter denial, it doesn't sound impossible that in 2035 anti-helicopter mines or anti-helicopter fuzes for conventional mines would be in more popular.

The best use for such mines would propably be that the mission editor has preplaced them in editor to limit helicopter usefulness, while still allowing him to give the player helicopters.