Recommended Range extender for double storey house

[missionimpossible]

I've started looking at a few range extenders, I've got my Fibre unit installed downstairs. However I have varying wi-go signal quality in rooms upstairs. Incidentally my study room upstairs seems to have the weakest signal. My total house floor area is 200 sqm.

What range extender can you recommend?
And where should it be installed?

Thanks in advance.

 

[Thor]

Ubiquiti Unifi AP

 

[midkemia]

Ubiquity new AP available with latest AC wifi and 5Ghz:

Ubiquiti UniFi Dual Band AC Lite AP ( Retail Incl VAT R1,550.00 ) or Ubiquiti UniFi Dual Band AC Long Range AP ( Retail Incl VAT R1,995.00 )

you can get them from scoop distribution if you want better pricing: https://scoop.co.za/products/wireless-networking/ubiquiti-unifi/

 

[portcullis]

As per Thor187 and midkemia...

Install a couple of Unifi APs and disable the wifi on your existing router.

Job done!