Before portable treestands,I shot a whitetail,straight down beneath me from a maple tree.My "platform" was a limb,sloping at about a 30 degree angle.I'd guess about 12 feet.I shot one antelope at 30 feet.I once let app.30 doe and fawn antelope pass by me at 20 feet,while I hunkered in tall weeds.The buck was last and I had to let him get by to draw and shot him at 40'.I believe antelope have trouble focusing at very close ranges 30' and under,especially if you are in some cover.