At least it's not a skunk. I've had to deal with them under my porch.
Bruce, a wireless driveway chime from Harbor Freight isfairly inexpensive. Also, next time you shoot a skunk, a lung/heart shot will keep them from spraying.
Hi BruceIf it were me and I wanted a highly controlled shot situation then I would set up a bait station. Most commonly ground hogs forage at dawn & dusk. This can vary due to location though. Primarily, groundhogs eat grasses, garden flowers, clover, alfalfa, and dandelions. In addition, groundhogs like to eat garden fruits and vegetables like berries, apples, lettuce, corn, and carrots.A 5 footlong section of 24 inch high chicken wire suspended between two stakes would be what I would set up.I would put it at a location that I had seen the groundhog feeding or would want it to feed at.I would suspend some carrots, corn on the cob or even a bunch of grapes right at the top of the chicken wire..This would require the groundhog to rise up on its haunches in order to feed.By rising up in that way, it would likely expose the top of its head for an unobstructed shot.Good Luck and Best Wishes - Tom