I use a small digital kitchen timer that I got at Radio Shack 15 years ago. I think you can find them at the grocery store. They are small and you can glue a clothes pin on the back and clip it on your antenna. The cool thing, they count down and then beep. So you don't have to keep looking down at them, the audible alarm allows you to keep your eyes on the plane.

The entire list is optional. You decide if you want that stuff.