Neil deGrasse Tyson claims that radio waves are an ideal method for intergalactic communication because they can penetrate obscuring interstellar dust and gas.

“radio waves don't carry much energy so you want as much of a collecting area as possible to get as much of that signal whatever it is and wherever it's coming from in the universe so that you can take it decode it and figure out what the hell's going on and what's interesting about radio waves is th”