Most of the post-processing services use reference stations that are surveyed 
and verified to mm level accuracy. The 13 reference stations used by AUSPOS 
were uncertainties  all less than 4/4/8 mm.  Unfortuenatly some of the 
baselines were rather long.

My antenna is swimming in multi-path and other signal killers.  A two story 
house < 25 feet to the west,  tall trees,  antenna on a terrace surrounded by 
low-ish walls with 10 foot columns in the corners,  stainless steel gates, etc. 
  Heather suggests an elevation mask of around 40 degrees.
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