In my book a network of other goTenna users counts as external infrastructur. Given the nature of the network IŽd consider it fairly unreliable.
With the cell phone frequencies the communication will basically be short range and line of sight. In conclusion IŽd rate the gadget as mediocre at best (provided one has no access to CB or HAM).
Being a HAM guy, my real opinion about the gadget may not be family friendly enough for the forum.
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If it isnŽt broken, it doesnŽt have enough features yet.