SETI's current monitoring of RF is a noble cause (in my opinion). How can we hope to discover other intelligent life if we don't listen? But as I understand it, it is sort of pathetic in terms of the handful of frequencies they actually monitor. So this lead me to these questions: What would it take to monitor all practical bands of the EMS coming from all directions around Earth. Say if we wanted to be able to pick up any reasonably strong signal from within a 50 light-year sphere around us? "Reasonably strong" is not an exact number, and I don't know enough about the subject to present a number, but lets say if we broadcasted a TV show from one of our satellites into space instead of towards Earth. We can't monitor everyone at once simultaneously (can we?), so let's say we want to scan for every frequency within that sphere once per year. It would require a massive amount of equipment, but how much roughly would it take? And perhaps more importantly, how much computing power would it take to search all that data for hints of an intelligent broadcast?