Anchor Plate

You are operating portable from a picnic table and you want to provide some strain relief for your wire antenna. With this plate, loop some cord through some of the holes. Drop it in between the table top slats. Now, connect your strain relief to the cord. Or use a small bungy cord with the notches in the side. I'm sure with some experimenting you will find all sorts of ways to use this plate.

Tip: print it in a bright color so that if when you are packing up it falls below the table you can easily spot it!