Hi all, this is my first post so before my question I want to show my appreciation to this community for offering a great framework to talk physics between experts and others who chose different life career paths, such as me. I have always loved physics but the math... not that much. English is not my native language, so if at some point I don't make myself clear feel free to correct me. From my understanding gravitational waves travel through spacetime itself, the 'fabric' in within which our reality exists. Therefore, gravitational waves travel through matter contained in the universe (spacetime) 'as if it wasn't there'. If I am not terribly wrong with the pressumption above, an advanced civilization that could somehow generate this waves artificially, even if it was just at an infinitesimal scale, could use them to communicate with far away realms, since there is virtually almost no ressistance, interference or decay in the wave as it 'flows' towards the receptor. Is this conceivable? Shouldn't we humans try build a sensor as accurate as technology allows to try to pick something artificial up? Maybe SETI has been listening at the wrong channel? thank you, I don't know how the preffixes work, does intermediate fit?