Before anyone gets too cocky, remember that signal strength drops off at the square of distance. Even this tiny blip of range generally pales in comparison to the background radiation. We're still almost invisible to our own technology at any serious distance.
For a reference, see how absolutely difficult it is to talk to the Voyager probes. The signal they receive is absolutely tiny. (20 billion times smaller than what it takes to run a digital watch, see the Deep Space Network for what does the talking).
If any aliens have heard us, their technology already outstrips ours by orders of magnitude.