There are basically three kinds: 1. Cell phone towers for connecting to cell phones typically within a 1 to 5 mile radius of the tower. 2. Towers with dishes for point-to-point high capacity long distance wireless links providing backhaul capacity typically 1 to 30 miles between towers. 3. Towers supporting wireless Internet bandwidth distribution to fixed residential & business locations within a community typically within a 1 to 10 mile radius form the tower.