Right now, killing vehicles with swarm launcher means either being in sniping range where the vehicle driver cant hit you as easily or just spamming with in close range. The lockon takes so much time that if you were ever to get into a position where you're able to lock onto the vehicle somewhat safely, they'll have driven off behind someting by the time you manage to get a lock.

Something like sig radius should be added, so that swarm doesn't take long time locking onto stationary structures or big vehicles like tanks while not being instapwn against cars.

I agree it should be done by signature radius, this would also eliminate its use vs infantry.