Strange Radio Signal Found

This is astronomical in nature. Astronomers pick up "odd" signals not infrequently, the source is always found out after further study. Sometimes takes ten or twenty years, but no alien signal has ever been positively identified. The fact that this source is so far away yet powerful also suggests a natural source.

Radio (any EM radiation) is a terrible way to communicate over astronomical distances. Especially omnidirectional broadcasting. The power requirements are, well, astronomical, and the communication delay is far too long to be useful to biological entities with fixed life spans.