Get PCM radio equipment, set the failsafe options, and when the airplane is out of sight, turn off the radio. OR............

Do what a lot of us do. When you see that you're not in a position to land the airplane where you can see it land, setup the attitude you want it to land in and hold that as long as you feel necessary after it goes out of sight. We fly over corn for a lot of the summer and that works. You almost never see the landing when it's out in the corn because the corn near the field is taller than we are.