I don't know of your situation, room, or if you really have to be covert about it. But if you have room and you are not worry about people seeing it, here is a real easy and inexpensive way. Deer like to always walk without making noise. So around my garden areas away from home I plant vining plants like pumpkins, squash, and any type off tall vining plants. Deer do not like to cross through these because it makes to much noise. By using a trellis system and planting cucumbers or melons on them you can also create a screen. Some trailing bean varieties really grow fast also. Good Luck
Also as stated coyote urine works great, plus human hair.