Re: Small window of time
Not only that; signal strength has decreased dramatically since the early days of radio, in step with inreased receiver sensitivity. And much that used to be broadcast is now distributed over the Internet instead. Thirdly, broadcast transmissions today often come from satellites, which direct their output at a nicely absorbing body. I expect these trends to continue, at least until human colonies / spacecraft are scattered around the galaxy.
Biting the hand that feeds IT
