Try to keep the LOS clear of obstructions. In case of installations over vegetation and
forest, make sure the direct LOS stays above the trees; in urban environments - above
the tallest buildings along the radio path
The influence of trees can be variable, depending on seasons (ice, dew, leaves). Keep
in mind that, during spring and summer, leaves can absorb high levels of radio energy.
Therefore, when installing during the cold season, over forests and trees without leaves,
try to achieve a higher fade margin
Proximity to other antennas should be avoided
Reflecting surfaces should be considered (buildings with reflective windows, water
surfaces or wet grounds). These can be useful in NLOS situations, where there is no
direct clear path between the 2 antennas, so the radio signal needs to be reflected off a
surface. However, these can also decrease the signal quality when encountered along a
clear LOS link, because of fading caused by multipath
When installing antennas over water, tune the height bracket within 1-3 meters range
variation, because it can yield significant signal level variations due to multipath fading
If seasonal changes influence the signal quality, then the most probable reasons would
be either that the connectors are not protected well enough from humidity, or that the
cables, connectors or antennas are covered by vegetation during summer or ice during
winter.
When planning the antenna placement for connections, one must consider the necessity PtMP
of a circular or sector coverage areas. In this respect, it is not recommended to use omni-
directional antennas when sector antennas can be used.
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