National radar network consists of many radars located all over the country. The radar horizon should be unobscured to the extent possible determined by the local orography. If the surface of the country is flat, one can avoid blocked sectors and find a location not far from optimal. In mountaneous regions unobscured locations are found only on mountain tops; such a location location is nevertheless problematic for many reasons. Locations at airports should be also avoided to be able to provide best service to aviation customers.
