Antennas using 802.11n have been able to achieve transmission distances over 300 km unamplified.
Well that is more interesting! If something like this could be used to link cities.
I'm guessing that terrain matters though and this "300km" was line of sight?
feet, not kilometers.
304 km
http://www.v3.co.uk/v3-uk/news/1984314/wi-fi-world-record-set-304kmhttp://en.wikipedia.org/wiki/Long-range_Wi-FiYes, it has to be line of site.
link first established on 2007-06-16
it appears to be permanent from Monte Amiata (Tuscany) to Monte Limbara (Sardinia)
frequency: 5765 MHz
IEEE 802.11a (Wi-Fi), bandwidth 5 MHz
Radio: Ubiquiti Networks XR5
Wireless routers: MikroTik RouterBOARD with RouterOS, NStreme optimization enabled
Length: 304 km (189 mi).
Antenna is 120 cm with handmade waveguide. 35 dBi estimated
I imagine with a VLA you could get thousands or even millions of miles.