Yes, you are right, the bird will complete a mission without the RC signal. However, I believe tevek was talking about End-of-Mission actions; what happens when the last waypoint is completed. Hover is the default end-of-mission action, but if you prefer, you can also set the end-of-mission action to Autoland or RTH. But those end-of-mission actions will only occur if you are within RC range. That's one more reason it's a good idea to set the last waypoint near the Home point, so that you can have the mission include an Autoland at the home point if you want that.