Inconsistent "low radar" behavior for helicopters vs. mobile anti-air missiles

Currently, attack helicopters and the Little Bird can fly low to avoid radar lock — but this protection only works against radar-based systems, NOT against the heat-seeking missiles used by mobile anti-air. What feels unfair is that the helicopter suffers no reciprocal disadvantage at all: they can still see me perfectly, aim, and attack freely from that same low altitude while my missiles simply cannot lock onto them. This creates a one-sided advantage where they get to choose when to engage while I'm denied the ability to defend myself. I suggest either making low-altitude evasion work consistently across all systems, or applying detection/accuracy penalties to helicopters flying low so there's a fair trade-off.