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.

Add these values to find the proper antenna height. 

 

 

Table 1.

  Wireless Link 
 Distance [km] 

     Fresnel Zone F     
 (60% at 2.4 GHz) [m] 

  Earth Curvature E 
             [m] 

  Antenna Height H    
 (no obstruction) [m] 

          1                4               0.02                4.02
          2                6              0.08               6.08
          5               10              0.5               10.5
         10               14               2                      16
         15               17               4.5               21.5
         20               19               8                27
         30               24              18                42
         40               27              31                58 

 

This is theoretical data and there are some cases of customers with working links, with line of sight (LOS) just a few feet over the top of obstacles on their path. We want to emphasize the need for clear line of sight. Trees should not be in the way. We recommend that the height of the tower should be the minimum of the earth curvature plus Fresnel Zone clearance height, making sure that this height is at least 3 m above the top of any obstructing object before you start testing the link.

Conclusion

To ensure optimal wireless connectivity several rules of installation must be followed. By not considering the factors outlined in this article you may not receive signal on the receiving antenna end of the link.