You know what annoys me the most? We don't even know what we are looking for. In Masquerade, there was the legend of the golden Hare buried somewhere in England. Hence, the reader had to find location clues.
What are we looking after? Is it a message? Is it a location? Is it the content inside the Unknown Artifact itself?
We only ever found out about the Morse Beacon thing because Michael Brookes himself told us to "Listen" to the dammed thing.
If you tell a man to wander until he arrives, but he doesn't know were he is supposed to go, he may, one day, arrive there, but he himself will never know such.
Afaik, major testing with its sounds already went down before Brookes said anything. It was a mere confirmation for what already has been done, and more detailed testing followed.