I thought of this many years ago. Problem is, firstly need to have a very good friend really close to exchange=FAIL; secondly,line of sight = FAIL, ridge to the north of me;mains=FAIL, no mains up on the moor; reliability = FAIL, 135 mph winds will shred the hardware.
Someone else locally is already doing this, ill-advisedly called ‘SkyeNet’. They have a node in this village in fact. The wireless people that is, not the evil murdering robots from the future.