[time-nuts] GPS Antenna on Tower.
jimlux at earthlink.net
Tue Jun 20 08:03:49 EDT 2017
for geodetic measurements, they drill a hole down to bedrock, and run a
pipe down to anchor the antenna to the bedrock.
"All holes shall be drilled straight enough so that PVC casing can be
installed in the top 15.5 ft of each hole, and that the steel pipe can
be freely lowered, not forced, for its entire 35 ft length."
Google for Ken Hudnutt's or Frank Webb's papers
or a 3m tall monument for a CORS station
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