I recognize this thread is closed. I found this thread after being frustrated with a WizFi210 Arduino Shield. Several commands in the manual do not work, it is only 802.11b though the documentation says 802.11 b/g/n compatible (I have a WiFi scanner) and only comes up in AdHoc mode, not Infrastructure as I had wanted. Using an external antenna, it has about the same transmit power as another wifi board that I have that uses a pcb antenna. I can't get it to go into WPA2 security as advertised. Again - I have a scanner that clearly shows all wifi devices in my office. I will take the advice and purchase the standard Arduino WiFi shield and be done with it.