Screwdriver
I stick a large screwdriver into the ground as a stake. Then I use a chunk of rope that has a loop tied onto either end of it and wrap it around the tail/aft fuse. The loops then are placed over the screwdriver to complete the hold down.
Tent stakes work very well also, and are actually better in some ways because they have the little horn at the top to act as a catch for the loops. Though screwdrivers are easier to stick into the ground as they require no hammers.
-Auger