The various WiFi flavors (802.11b/g/n) work pretty well if you are within their relatively tiny (100 meter or less, mostly less) radius. WiMAX networks (like Clear) are promising but are not widely deployed in the U.S. and may be somewhat spotty in places it is available. 3G networks are more widely available but can be hit or miss too. What we really need is something in between WiFi and 3G to provide gap coverage. Perhaps “White-Fi” which uses the unused spectrum left after TV stations converted from analog to digital can provide this. InformationWeek reports that Microsoft is testing this network technology on their campus. Two “White-Fi” transmitters were placed on Microsoft’s 500 acre Redmond campus for the test. An area this size would need hundreds of conventional WiFi.

Microsoft Launches Massive Wireless Hotspot