In equivalent conditions, some people use this:
http://vonets.com/ProductViews.asp?D_ID=86#
Is that what you're talking about ?
For information :
"VAP11G-300 is a professional 300M WiFi repeater that is elaborately developed by HouTian Network, the original creation D/A temperature compensated auto frequency control technology (TAFC), it solved the common failing of the traditional WiFi signal or WiFi products that easily drop the network, make sure the lasting stability to ensure that the WiFi signal is not dropped. It is based on IEEE 802.11N standard, can extend WiFi Network range, provides the stable transmission up to 300Mbps, also is compatible with IEEE 802.11B and IEEE 802.11G standard."
