With just a basic mains-USB repeater in my loft and mains-USB companion radio always on in the house (less than £60 all in), I can message all over the UK and into continental Europe. Still dependent on the power grid but it can be a good place to start.
@CYPHERMUNK HOUSE | LONDON now hosts an off-grid, solar MeshCore room server and repeater, building up decentralised communication capability. #meshradio#meshcore