I just placed about quarter of a very ripe cantaloupe in the back of the cage. I put a half of a Granny Smith apple next to that. I poked a hole in the apple half and ran a wire tie through the apple securing it to the side of the cage. I ran a long thin stick into the top of the cage penetrating the cantaloupe and into ground under the cage. What ever enters that tarp will need to work a bit to abscond with the meal.
There are a few hours of daylight left and the groundhog is active running about my yard. When it gets dark I'll go out and trip the trap so the door slams shut keeping the raccoon from reaching the bait.