Vaisala WXT520 - Manual (Page 25)

Chapter 2 __________________________________________________________ Product Overview
VAISALA_______________________________________________________________________ 23
0804-007 Figure 7 Bird Spike Kit (optional)
The optional Bird Spike Kit for WXT and WMT transmitters is
designed to reduce the interference that birds cause to the wind and rain
measurement. The kit consists of a metallic band with spikes pointing
upward. The kit is installed on top of the transmitter, and attached with
a screw. The shape and location of the spikes has been designed so that
the interference with wind and rain measurement is minimal.
The spikes are designed not to hurt the birds; they are simply a barrier
to make it more difficult for birds to land on top of the transmitter. Note
that the bird spike kit does not provide complete protection against
birds, but it does render the transmitter unsuitable for roosting and nest
building.
Note that when the kit is in place, more snow can accumulate on the
transmitter, and the snow may melt slower.