I put 4 fence posts at the corners of my garden, strung heavy cord around the the posts. Then I tied white plastic bags (Walmart, etc.) about 3 feet apart all around the garden. Puncture the bottoms or they will fill with rain. The slightest breeze will keep them moving, spooking the deer. Neither my corn or my peanuts have been touched, and the deer really love peanut vines.
Russ