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Hi Ryan. This is a bit hypothetical in that there is nothing within 1 light-year that would be likely to harbour intelligent life. If it were a spacecraft then the extraterrestrials would clearly be more advanced than us.
We've maintained contact with the two voyager probes for 1/3 of a century with obsolete equipment running under low power with radio. And, with the combined effort of all the satellite dishes (on half the world), and a few very large dishes we could blast it with a quite a powerful signal, as well as having very good listening coverage.However, in a sense, all EM spectra are similar, except for background contamination.