Wi-fi repeater or router - which is better for a country house?

Question

Computer networks

Good afternoon.
I have a country house, a router is installed in it.
In the bath, the reception is very weak, only at the window / in the attic.
It is necessary to ensure reliable operation of the wireless network throughout the sauna building.
I see such a solution to the problem - a kind of device that has two antennas, one directed to connect to the main router, the second omnidirectional to create an additional wireless network.
What can be this device?
I see wi-fi repeaters for sale, are they suitable for solving my problem? Can you recommend a good model?

Answer 1

Maybe take some kind of repeater, for example from TPLINK, and put it in the attic?

Answer 2

I have two directional antennas Ubiquiti NanoStation M5 in one of the offices. Distance between points in the region of 300 meters. But you can probably get by with cheaper repeaters.