Hello all, this is my first post so I hope it’s in the right section. I am currently working on a very ambitious project which uses a Raspberry pi 3 B+ a Pi Hat and 3 raspberry pi’s assembled into a nice little cluster, along with some pi cameras. I have 3D printed a box that will house this cluster and the cameras along with a big battery to power it all attached to a nice solar panel.
I want to place this box somewhere that has no immediate WiFi in the vicinity but I still want to be able to communicate with the pi remotely from a distance of 2-3 miles at most. I was originally going to use an RPI900 and communicate with it using Radio frequency and serial communication. However the RPI900 is a currently defunct product and is relatively outdated.
I was wondering if there was any other good way to communicate with a pi over a fairly long distance without the use of WiFi. Is there any other method of communication or am I stuck with radio frequency? The end goal is to have many of these boxes each housing a cluster and cameras and I want to be able to communicate with the master node (Pi 3 in this case) located in each box. Any suggestions would be appreciated! Thanks for reading this wall of text lol