The very observant will notice that thus far you haven't seen a gate but just warning signs. The gate is hidden beyond the hills, but if you carefully climb the hill towards the west, you can see the guard shack.
Not a lot of activity goes on here. Maybe years ago when the borders were much closer. You would never get this close this day and age.
Could be a place you might end up and questioned if you are caught snooping around Area 51.