Most powerful wifi?
I dispute this claim, at one point we used a 500mW wifi module into an antenna with 16dBi gain, but then we had a "Notice of Variation" issued by OFCOM and they specified what SSID was to be used. This was for short term use, not in a built up area BTW.
Isn't it a limit of the ERP rather than the power? Came across this with upgrading routers with after market antennas.