NavCom SF-3050 Rev.I - Manual (Page 146)

SF-3050 GNSS Product User Guide – Rev I
B-127
Base Antenna Radiation Pattern
Figure 117: Base GNSS Antenna Radiation Pattern
Optimal antenna performance is realized at elevations greater than 35º.
There is an 11dB variation between 15º and 90º elevation (factor >10x); therefore, lower
elevation satellites are always more difficult to track.
There is a 9dB variation between ~35º and 0º elevation (factor >8x)