This would work. According to my calculations. If one was off by
3-4 seconds, say 3.5, that would be 3.5s times 343 m/s (approximate speed of sound in air) which means you would have to sit about 1200 meters away. Thats about 3/4 of a mile. But you would have to turn the way volume up... and need a long extension cord should you choose to sit in your house and move the radio outside. Or one could try this:


Attachment 549

This approach could put you in a parallel universe, and then anything goes.
Do not try this at home without my supervision. I have experience.