Leica mojoRTK How-To Manual page 6

Table 1 – base antenna heights for 40% and 0% obstruction of the first
Fresnel zone over flat ground.
Distance (km) 40% Obstruction
US Standard/Imperial Units (868MHz and 900MHz)
Distance
(miles)
NOTE: the calculations in the table were made using an online Fresnel Zone calculator and the antenna heights
listed are:
0% Obstruction Antenna Height
40% Obstruction Antenna Height = twice the sum of the 40% Obstruction Radius and the midpoint ground
You should also think about obstructions that you may get when trying to
receive the signal past objects like trees, sheds, silos and so on. Think of
these elliptical zones from a top down view as well. Just because you have
direct line of sight to the base station from the vehicle looking past an
object doesn't mean that you have unobstructed base communications.
For more information
www.mojoRTK.com
Page 6/9 Document #1060 rev1.0
Metric (868MHz and 900MHz)
Antenna Height
(m)
2 16
4 22
6 27
8 33
10 38
40% Obstruction
Antenna Height
(feet)
1 44
2 63
3 80
4 94
5 108
6 119
st
= twice the sum of the 1 Fresnel Zone radius and the midpoint ground
elevation due to Earth curvature
elevation due to Earth curvature
0% Obstruction
Antenna Height
(m)
26
36
41
54
61
0% Obstruction
Antenna Height
(feet)
72
105
134
154
176
193