It runs in the 2.4 gigahertz spectrum and shares that spectrum with microwave ovens, some satellites and 2.4 gigahertz cordless phones. 802.11b has a range of approximately 150 feet. Plenty enough range for the household (even good if you want to take a stroll in the back yard) and it can even penetrate walls. In corporate and university settings, several base stations and antenna amplifiers are installed to cover the large spaces and even courtyards of the average large business.