100 meters is good for Ethernet so if you did a POE you could in just 2 runs get it over a cheap, reliable Ethernet run.
There are line of site links but you can google those. Downsides of off the shelf WiFi is that you are way over the distance.
Bob
Hi hoping for some help I am living on a small island on the east coast of Santo, Vanuatu I have internet available by 3 g to a modem then wi fi in my house . I want to extend this some 200 m across the island to a holiday house where there is no 3 g signal . Where do I start
Thank you for any help

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