I hooked up the USR WIFI232-S serial to wifi module to my laptop and spend a while seeing how well it connected to my access point from different locations. Only 4 wires were needed +3.3V, 0V, TXD and RXD so I was able to use a small USB to TTL converter to do the testing.

While I did not do anything extensive, I managed to connect fine from up to 70M from my house which is about the same as my cell phone and a little less than the RN-131 which managed 90M.

This was the last piece I needed to check so I will add the unit to the PCB and begin laying it out later this week.