One option might be to try one of these, might extend the range -

https://www.ebay.com.au/itm/USB-WiFi...frcectupt=true

If that does not work you may need a directional antenna with more gain. One way to do it is with the adapter above connected to a directional antenna (known as a Yagi) similar to this (could not find an aussie supplier on ebay though) -

https://www.ebay.com.au/itm/Outdoor-...KTAencw%2FotGD

Connect the adapter to the laptop via a CAT 5 cable using CAT to USB adapters -

https://www.ebay.com.au/itm/USB-UTP-...YE~S:rk:6:pf:0

Should look like this
Untitled.jpg

Might not need the antenna, the WiFi adapter up on a pole might be enough.

I have used the same setup to connect to free wifi from our local library which is around 500 meters from home. Stick the antenna up as high as you can.