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"Using Wi-Fi signalling to reach up to 25KM"
Under current ACMA licensing and the physical size of that unit, several hundred meters at best for current Legal and safe RF power limits.
To travel long distances, you need power frequencies like VHF or HF. UHF and microwave is NOT for long distance comms (unless using fixed, high gain antennas with LoS (Line of Sight)).
Before going to remote areas alone, you take a EPIRB and/or have HF radio or SAT phone.
You can also get legal high-gain mobile network repeaters from Cel-Fi shortly (Cel-Fi GO) that will enable longer range comms in fringe areas. http://cel-fi.com.au/cel_fi_go_repeater.html
Just for the record, eBay (or any other source) bought repeaters from anywhere other than Cel-Fi are illegal!
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