Recall that any signal received must be weighed against the intervening space time distance quandary. A signal received from the galactic center was sent ca. 30,000 or so years ago. Our response would then be received in the same amount of time, with an immediate turn around time of 60,000 years. Civilizations can rise and fall in that amount of time, though short on cosmological scales.
Earth’s electronic signature is a light cone of some hundred years, with AM signals likely to be lost in the background static, it seems that we need only to realize that that light cone is ca. 80 years. Hence, to detect Earth and our civilization, such as it is, bearing in mind the inverse square law which governs the photon flux of the signals falling on a particular receiver, how many civilizations are cruising in this area prepared to listen in?
Frank Drake’s equation about viable interstellar and galactic spacefaring civilizations seems limited at best.
Beyond the concerns of time dilation at the speed of light, it seems that there isn’t a great deal to worry about.
Hartmann352