[Kip Russell]

I'm curious to know how we know that, considering the fact that we don't have a receiver hundreds of light years away from here to check it.

Perhaps I phrased that poorly. How about this: "Narrowband radio broadcast should be detectable with current technology at a distance of hundreds of light years or more, given our understanding of how radio works."

[Windflier]

How about this: "Narrowband radio broadcast should be detectable with current technology at a distance of hundreds of light years or more, given our understanding of how radio works."

Works for me.

(I'm too tired to argue too :-)