Make:

Mattw writes - "What happens when the grid breaks? Communications need to be restored. After Hurricane Katrina hit, BellSouth announced that it would take 3 months to restore phone lines. Volunteers using WiFi gear were able to connect churches and community centers within the first weeks and within three days of setting up an asterisk call server, routed 10,000 phone calls. Reliable backup infrastructure can be brought up in hours or minutes if you are prepared and have a plan in place.

Here is a plan for a mobile mesh repeater node to be used while you are setting up permanent installations, doing site surveys or for completely mobile teams." - Link.