WDTV Live Streaming & USB Dongle 5GHz

I am considering buying the WDTV Live Streaming.

I know it has internal WiFi, but it is only 2.4GHz. Anyone knows if USB WiFi dongles are supported (to support 802.11n in 5GHz band)?

Thanks in advance and excuse my bad English

No.  External USB WiFi dongles are not supported.