haha, from the antenna description
“Approximately 1.9mile range (3km) of each device Outdoor Directional Antenna is connected to”
I’d say this would cover what your looking for, as for the connection to the router, “WLE-LNC Pigtail Adapter Included”
Then you just need the computers to have wireless cards, or another wireless router configured properly to function as just a receiver, then distribute through wires/wirelessly to your other machines