ashtech HDS800, Reference Manual

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Chapter 4. Integrating HDS800 into Your
Application
Installation Instructions
GNSS Antenna
First find the best place to install the GNSS antenna. Follow
the usual recommendations for a GNSS antenna. Remember
that the chosen location should be free of any close obstacles
that could hinder GNSS reception, and mechanically safe for
the antenna (no nearby parts in motion liable to damage the
antenna).
Make sure you can easily measure the antenna height from
where you install it. Accurately measuring the antenna height
with respect to the height reference on the vehicle, machine
or ship is critical for getting the best performance from your
equipment.
Receiver
The recommended setup for the HDS800 when used in harsh
environments (vibrations, etc.) is to secure it from
underneath. The bottom plane is fitted with four tapped holes
M4 (tap depth=8 mm max.) forming a square 100 mm
(3.93 inches) in size (a VESA-compliant feature).