What equipment to choose for building a local network via Wi-Fi for 2 km with open visibility?

Question

WiFi

In open space conditions, it is required to connect several computers with a local network.
One is motionless ("standing in the corner of the field"), the
second one moves arbitrarily in a sector up to 150 degrees at distances up to 2-3 km. ("runs around the field") and does not know where the second, i.e. here the antenna should be 360.
There are 220 volts at each point. Antennas can be raised several meters.

Requirements
- communication stability
- line of sight 2-3km
- moisture resistance
- speed from 5MBps Tell me

, what equipment to choose? what manufacturer? what to pay attention to?

Answer 1

How fast and how often does the second computer run across the field? Can he stop and aim the antenna?
Is it possible to scatter several repeater devices across the field, operating on the principle of "communication with the main point - via cable or directional antenna; communication with a running computer - standard WiFi"?
It seems that such coverage should be provided by cellular communications. You can dig in this direction. The question is how much it will cost to put up your tower; or use an existing provider.
Or you can just stupidly raise the WiFi power on both computers. Especially if it is in the middle of nowhere, far from the city.