I would really consider the antelope decoy as long as I knew who was around. (Excluding poachers and tresspassers.)
I have used them for turkey for a long time with no bad experiences. Of couse I always am on the lookout for other hunters trying to sneek in on my setup.
I would hope that even poachers would be able to tell the diference between a flat lifeless antelope decoy and the real thing.