It's been around for 50 years
It's called amateur radio.
After the Sumatra-Andaman quake and the resultant tsunami the only way to pass messages for days, if not a week or more to many islands (which had in some cases been submereged totally, albeit breifly) was amateur radio.
Digital modes such as PSK31 are incredibly robust, use almost no bandwitdh (about 60Hz) and need almost no power. 5 watts is sufficient with a simple wire aerial to get error free copy from the UK to Ukraine for example, as I was doing last night.
But hey, it's not something you can easily chuck money at is it a solved problem so let's ignore that part.