Hi Mike,
Yep, you can use pretty much any wifi extender with your Billion.
They simply need a power point as they wirelessly log on to the main router's signal as a client device and then reproduce the signal for that area.
I use a NETGEAR WN2000RPT Universal WiFi Range Extender for my Foxtel IQ box in the Games room which has no CAT 5 cabling, as the unit has a 4 port ethernet switch so I can plug a CAT5 cable into the Foxtel to get downloads.
Works a treat, cost less than $100.
You can even buy one from JB Hifi that simply plugs into a wall socket and has two aerials for even simpler extension of the wifi signal.
http://www.jbhifionline.com.au/compu...xtender/657346
Cheers
Chris