I am sharing a concept of mine called SegundoNet
slides: http://slidesha.re/1i8amDh
blog: http://jaksprats.wordpress.com/2014/04/21/segundonet-a-secondary-cell-network-built-cheaply/
It is a secondary cellular network using GoogleFiber for its Backhaul & TV WhiteSpace (and other unlicensed spectrum) coordinated via Cognitive Radio as spectrum. It is a pretty cool and very doable concept, enjoy :)