Since all of the public service agencies in my county (Allen) are/will soon be dependent on MARCS, I've been wondering about the wisdom of putting all of our communication eggs in one basket. How is MARCS set up to avoid a catastrophic failure if our local tower or some other major component goes down/fails? Is there even a remote chance that we could have a total (MARCS) blackout? If so, then what? Prior to MARCS, units could still communicate directly, albeit less effectively, without going through a repeater. Isn't that now impossible?