WiMAX is an alternative to wired broadband, such as DSL and cable modem, and according to the forum, "provides fixed, nomadic, portable and, soon, mobile wireless broadband connectivity without the need for direct line-of-sight with a base station."
Compared to the more prevalent Wi-Fi (IEEE 802.11), whose coverage maxes out around 300 feet, WiMAX will, in theory, transmit a high-speed signal for 30 miles in every direction from a fixed station. Mobile stations will transmit three miles to 10 miles out.