It sounds like you are setting your blind up at a waterhole?There are quite a few factors involved with success at waterholes. First and foremost...how many other water sources are in the area? Obviously if there are quite a few watering holes the wiser bucks will likely water elsewhere until they get acclimated to a blind. I've had does,fawns, and small bucks come in the day I set up my blinds in areas where my blind was set up by the only water source available.
Next, what is the weather forecast. If it is rainy with puddles everywhere antelope may not come in to the waterhole w/blind. How well does your blind blend in with the surroundings? Does it stand out or blend in with the other vegetation. What size buck are you looking for? If you aren't too picky smaller bucks may come in the day you set up your blind but unless there aren't any other water sources for miles a wise old buck may water elsewhere. Good luck!