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How about the Garmin T5? It is literally made for this, no?

Edit:

https://www.amazon.com/Garmin-T5-GPS-Dog-Collar/dp/B00L3C5ED...

It's a bit of a pricey solution, and typical range is 4-5 miles I believe. Seems to be popular with people who use their dogs for hunting moose etc.

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That's similar to what I had, you also need a gps receiver, so your investing close to 650$, not great for when your dog smacks it on a rock or tree. The problem is in a mountainous area you need line of sight, so it became practically useless, I would constantly loose the signal. Combined with the battery life in cold weather... The only solution was a satellite connection or creating some sort of mesh coverage like the OP link suggests.

ps. Most dog trackers also do not work outside usa.

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