Spectra Precision FAST Survey Reference Manual - Manual (Page 381)

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USCG/DGPS RTCM sub-meter RTK GPS receivers.
Shown below is the front panel view of the Ashtech Z-Xtreme, as it appears in the top of the backpack.
Shown in the next photo is the cabling for the Z-Xtreme, looking at the back panel.
Configure Base or Rover
 Current tab - Model:
You must specify the model of Ashtech equipment to be used.
 Receiver tab - Antenna Type
: A pull down list that includes approximately 50 different antenna types. Shown in
the below photo is the Geodetic 4 antenna.