What sort of emergency are you planning for that would take out both POTS (dial up 56K), GSM/EDGE (850, 900, 1800, 1900 MHz), UMTS/HSDPA (850, 1900, 2100 MHz), T1, DSL, ADSL (2,2+) for your required data connectivity but not also take out another network such as HAM packet radio data (if available) or even your own network constructed using the fixed non LOS wireless Ethernet connections etc.
A hurricane can do that quite easily, especially since repairing damage is not a simple task since merely getting to a site may be an adventure.
Even Line-of-Sight goes a long way in flat terrain. On a clear day you could see skyscrapers in downtown Houston from where I grew up 30 miles southeast of Houston: it's not hard to imagine being able to reach a repeater atop one of those buildings.
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