So I was wondering do the antelope come to the water holes all the time or off and on? I saw them laying down by the water hole Saturday evening and they haven't been back yet.
They'll normally come to water at least once a day, but they can have more than one water source in their area. That may well be why you haven't seen them back at that one particular spot for a couple days. I might also ask where are you do your watching from? Are you doing it from a distance as you should be so you don't disturb them?