On: It's too late to worry that the aliens will find us

[bombs]

Detecting this leakage radiation won't be that difficult. Its intensity decreases with the square of the distance, but even if the nearest aliens were 1000 light years away, they would still be able to detect it as long as their antenna technology was a century or two ahead of ours.

How? If radio waves travel at the speed of light and the first radio transmitters were in operation in the late 1800's, this would mean that the transmissions would be no further than 150 light years or so.

There are stars in this range, sure, but I'm interested in how antennas outside of this range might be able to pick up the signal.

[eavc → bombs]

He means that the signal would still be detectable 1000 light years away. You're right that we're a long time away from that being a possibility.

[younata → bombs]

I think the statement is more to show that it's not that hard to detect signals.