I agree with you on that knightstorm. I don't expect that any advanced alien civilisation would attempt to communicate over interstellar distances using electromagnetic radiation. Extremely unlikely.
That said, there are still plenty of uses for huge radio telescope arrays.
Antihelium, cool.
(horribly titled article though, quite misleading, not a star, but an accelerator). Detection is one thing, storage is another. But, we get closer. I have a theory on an implementation of an alcubierre warp drive using stored energy (a lot of it).
The Alpha Magnetic Spectrometer (AMS) experiment, scheduled to be launched on one of the last space-shuttle missions to the International Space Station, is an instrument designed to do just that. A principal part of its mission is to hunt for distant galaxies made entirely of antimatter.
Mind goes boom!
That would be so far out. With our luck, if we were to detect such a beast,
that is where we will find intelligence.