How to Communicate Between Robots in a Obstacle Environment

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Hello, I am recently working with ROS. I am trying to communicate between robots in ranges of 5km by radio. The Idea is to receive the data from each robot, like video, sensor data, as well, if necessary, the robot master control the slave one.

I have been searching for the technology that drones use, however, I think that It might not work because there are obstacles between them. There is also a possibility of a base station (“master”) that can communicate between robots, instead of a robot master.

Does anyone have an idea of how can I make this work?

Best Regards, MKMTI