Attack turret on any factional base or free standing turret. Run 32 meters from turret and force cloak. After successfuly cloaked let turret kill you. After the turret has killed you cloaked, clone. After you have cloned you will be invisible and be able to attack invisible.
Get on the stoop of a house and cover up. Conceal shot the turret and let it shoot at you. Once the turret kills you clone. Once you clone you will be invisible and attack anyone without loosing invisibility.