uirements are based on a preference order. The RF engineer designs a network through the process of site selection, satisfying both the need for good coverage and a subscriber base in the area. The initial work is done by software on digitised maps resembling actual clutter distribution. Thereafter the link budget, fading margin and penetration losses are calculated, as they are different for areas like urban high density, urban low density, semi-urban and rural areas. These determine the hexagonal (Hex) radius of the different classified areas, which finally appear on the plot obtained from the grid structure. The RF engineer goes to subscriber areas physically to choose the sites as close as possible to the grid centres. In case of practical problems, a suitable distance is taken from the grid centre, with future expansion and easy upgradability considered in subsequent phases. The operator intends to cover a maximum area under blanket coverage and provide good coverage to prime areas in order to draw subscribers. The RF engineer seeks mostly tall buildings, providing a bigger footprint with a lesser number of sites. While tall buildings provide blanket coverage in the initial stages, too high buildings can lead to interference problems. Tall buildings also create a 'shadow region' due to limitations of vertical beam width. Highways are an important source of revenue due to regular and heavy traffic. They are usually associated with high towers, providing maximum coverage without substantial penetration loss. Their heights are chosen while keeping in mind the future backbone networks spanning between cities. Finally, the surrounding obstructions are to be noted. Tall constructions like skyscrapers, towers or a dense forest cover with wide leaves should not be in the near vicinity as they might cause possible obstruction of the signal. Water bodies, solar panels and wide metallic sheets in close proximity can lead to signal losses due to reflection. Line-of-Sight (LOS) All sites are interlinked by microwave link