This is something cool I heard about a while back, but just now started doing some real research on. Thanks to KC5ONZ for explaining how a MeshNet can be used in Ham Radio, and thanks to WA5YSX for informing me that there is already a huge network covering most of N. Texas for ham-only activity.
All the info you want to know is here – read the page titled “Just Getting Started? Read This”
In short, this is a wireless network that is separate from the standard WIFI network used by the public. With certain routers you can change frequencies that the router uses, which fall inline with ham-usable frequencies, and setup a sub-network to communicate only with other hams. From what I understand there is an entire network already covering DFW, with Nodes setup on towers and buildings that any WIFI router, after modification, can connect to, and allow the operator to use this network for communications with other hams.
I’ve only just begun reading about it, so I don’t have all the info yet. However, I think I have found a router that will work for this application, so I plan to setup something soon.