the anti-helicopter mine is designed to operate against low flying helicopters. The 90 kg mine is activated by specific targets, identified by acoustic and radar Doppler shift signatures.
These mines could be a low cost solution to combat helicopter rush attacks from any faction and would also provide defense to resources behind your lines which could be harassed. Because of the small blast radius the helicopters would be required to fly almost directly over head. This means strategic placement will be the key factor to their effectiveness.
Because these mines should not be able to hit higher flying aircraft such distinctions must be coded in to prevent these aircraft being damaged. For instance a helicopter and plane both fly over the mine at the same time only the helicopter should be damaged not the plane.