If your starting at the top of the map then your going to want to run just to the left of the tank on the top right hand side of the map. Just before you reach it decide the angle and where your going to aim it. Look at the red radar dish at the top right. You will need to aim roughly at this to avoid grenades hitting ventilation on building 2's roof.This is for grenades but may work for other equipment. This doesn't always work but its fun trying. For the tomahawk i'd suggest aiming to the right or left of the radar as things like tomahawks have much longer range.