The radio planning engineers go for sites with lower heights, e.g. 12 m, which is contrary to the requirements of microwave link planning engineers for high rise sites. Low sites help in interference reduction while high sites increase the probability of getting connected to other sites due to a better LOS. When doing LOS, the microwave planning engineers need to have good coordination with radio planning, installation planning and civil engineering works because the same site may be used as a radio site, should have proper space for installation and should be strong enough to hold the equipments. To minimise site visits, LOS activity should be planned with each site visit. However, if the site is a transmission site only, then LOS activity could be planned separately. Surveyors should have all equipments that are necessary for doing the LOS, such as the global positioning system (GPS), binoculars, compass, single lens reflex (SLR) camera, mirror, searchlight or flashing beacon, large rubber balloons and gas, cellular phone (or very high frequency (VHF) radios), measuring tape (at least 50 m), maps (road and topographical), inclinometer for measuring heights of objects and telescopic mast (preferable m). Software tools with digital maps are a good starting point. The results, however, are not very accurate because of the inaccuracies related to the digital maps, but they can be useful for rejecting cases where LOS does not exist, e.g. a hill's presence between two sites, etc. For sites that are within a few hundred metres of potential sites, a site visit would be sufficient for confirming or not confirming the line-of-sight. Complexity arises when sites are a few kilometres from each other. In this case, the usual techniques do not work, especially if the site is a greenfield site. In such cases, balloons are used for determining the LOS. When the digital maps are not available, paper maps are used. When using paper maps, the two sites are marked on the map using the coordinates obtained by the site visit using t