Living in CA and dealing with what I think are these ants... you really are powerless. No amount of ant bait or poison will stop them. I've watched these things empty traps and come back for more.
SMDH
I will say that Diatomaceous Earth does seem to get the message across that they are not welcome. But using that only works in certain instances, and it has to stay dry to be effective.
Anyway... Not to pick on Friend
@Pogre exclusively... I too have my own warren of sorts, and it is called Transmission Line. Warren, or a brick wall to beat my head against; unsure which.
*scratches chin quizzically