Fluorescent orange does not make items invisible to a whitetail.
Sure they recognize antlers. Doe and buck decoys are used at various times during hunting season depending upon the rut. A large racked decoy can keep smaller, immature, and "bullied" bucks at bay.
I suspect you mean antlers only. I've seen moose hunters using nothing but antlers or a canoe paddle. Turkey hunters using fans only. Seems like a trial and error situation. I'm not going to rush out and try it.