Our telescopes have been looking for years. I don't think there is anything or we would have seen something by now.
Put a cup into the ocean, pull it out and you don't see any fish, does that mean there are no fish in the ocean?
No, it means your cup is very small while the ocean is very very big.
Same idea here...but the universe is much much bigger then the ocean in regard to our cup(or our telescopes)
I'm not saying we've made contact, but its very possible they are out there(and we may never make contact)