There is 0 chance my wifi reaches to my back 40, so I have to use cellular data. So I need the camera to encrypt the data before sending.

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I mean its probably not cost effective to protect the privacy of your critters, but Unifi makes some incredible network extension gear:

https://ui.com/us/en/wifi/building-bridge

Ethernet limit is about 100m. so maybe you could also just run a cable and put up a POE access point ..