Extending Wireless Signal

[#1]

My daughter lives in an old 3 story house which has been converted into 3 flats. A cable connection enters the house on the attic floor and this is where the router is situated. Ethernet cable comes from the router, directly to a switch in the ground floor flat, which works fine, but the wifi signal is abysmal this far away from the router.

Is it possible to use a second wifi router instead of the switch on the ground floor, (plugged into the ethernet cable), to improve the wifi signal? Would this work or is there a better way to do this?

Thanks

[#2]

You could look at a mesh network, something like BT Whole Home WiFi.

[#3]

The answer is yes if you configure it as a Wireless Access Point. If you use it in place of the switch you would only have three spare Ethernet sockets.