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Depending on the antennas and which WiFi router you use, yes a few KM is doable. For the situation You described I would suggest having a PC based server (like
by sigmaprimus 6y ago
Depending on the antennas and which WiFi router you use, yes a few KM is doable.
For the situation You described I would suggest having a PC based server (like SME) on the roof of the industrial building, then a DD-WRT client bridge with a "Yaggi" antenna on every customers house. The SME server will provide client specific control of internet access and logs, the logs will protect You from being accused of say pedophilia or incitement etc. if one of your customers is up to no good.
But to answer your question, yes if You have line of sight from the house to the building, with the proper directional antennas the range is unlimited.