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.
Discussion
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 ..