Two xbee SX868 modules – with mostly line of sight and a nice 3G antenna at the other end – I obtained a safe 1km range – going up to this 1.5km if a few errors can be tollerated (showing -94 dBm). Over wet an slightly frozen ground I got -95dBm at 1km. I did get a few packets at 2km but it was showing -96 to -100dBm (very weak). This gives us confidence to install GPS units up to 1km away from their base station in Iceland. 1km
