Our group installs continuous GNSS stations around the world to monitor ground motion over time for use in plate tectonic models, volcano monitoring, sea level monitoring, and earthquake studies. When possible we use Eddie Wheeler at Tech-2000 masts as GNSS antenna monuments at continuous GNSS stations. The masts are simple to install and level. To install the masts, we drill holes into bedrock or large settled concrete slabs and use Hilti HIT-HY 200 epoxy with 316 stainless steel threaded rod to mount the masts. We use doubled up hex nuts with fender washers to level the masts so we can get the best data with our antennas. 

For our purposes it’s important to have a GNSS monument that we can leave installed for as long as possible (up to 20 years or more).  With the Tech-2000 mast, the GNSS antenna mounts to a puck that slides into the top of the mast and is set with 3 set screws. This allows us to replace GNSS antennas as needed while keeping the integrity of the monument intact. Over the past 10 years we have had to swap out several GNSS antennas at sites with Tech-2000 masts, and it has always gone smoothly. We have never had to replace a single Tech-2000 mast that has been installed in the field.