Being the party pooper is a dirty job but somebody’s gotta do it..... The idea of anybody using radio waves or electromagnetic radiation of any sort to communicate over stellar or cosmic distances is idiotic and nobody with any brains or talent would ever do it. That wold be like trying to communicate with Germans by splashing pebbles in NY harbor and hoping the Germans at Bremen could read the message on the ripple waves when they got there.
The alien radio signals wouldn't necessarily be communication signals (i.e. "messages") - they could instead be simply technological artifacts, e.g., unintentional by-products of some other technological activity - just as a wisp of smoke over the horizon or the sound of hammering is not an attempt on the part of your distant neighbor to converse with anyone.
Regards