Any space faring race will need a means of communication that's faster than light. Even within our solar system radio communication becomes problematic at distances much beyond the moon.
Apple sells tachyon modems.
Um, anyway. This seems to assume that aliens might not only aim a laser at us, but at a 1.8 meter telescope of indescript positioning on earth.
Personally, I am betting on the Allen Array to find something. In my professional opinion, I mean...