Vaisala Hydromet Data Collection Platform - Manual (Page 39)

Chapter 2 __________________________________________________________ Product Overview
VAISALA_______________________________________________________________________ 37
UHF Antenna
The CompleTech antenna product range offers optimized antenna
solution for every application and installation requirements. The
product range includes omnidirectional antennas, dipoles, directional
and crosspolarized yagi antennas, and directional and multidirectional
stacked arrays to serve demanding telemetry needs.
All the electromechanics in the antenna are molded in polyurethane
foam and covered by insulating covers. This construction results in
extremely good combination of lightness, durability, and environmental
resistance. The effects of water, ice, snow, and pollutants on properties
of the antenna are minimized.
Depending on installation site, its function, and LOS distances, two
different kinds of antennas are normally used:
1. Directional antenna for stations with longer LOS. The directional
antennas range from simple one element yagi to multi-element
yagis and stacked yagis with increased gain.
0407-012 Figure 7 Directional Antennas with Different Gains
2. Omnidirectional antennas for stations function as repeaters or with
shorter LOS. Omnidirectional ground plane antennas are robust
antennas with high gain and especially suitable for repeater sites.