
2. Tick the External antenna option then tap on the "Please select!" button then select an external antenna from the tree you want to use


3. Select a geoid model at Settings > GPS > Geoid button

4. Create a new layer (in DigiTerra Map or ESRI Shape format) and make sure you have selected the Storing 3D coordinates option on this panel

The Height in the geometry will be = Height Above Ellipsoid - Antenna height - L1 Offset +- Geoid undulation value +- Offset value you are using on the GPS Survey panel to the layer (default value is '0' m)
Reference guide of the Settings > Antenna tab: http://digiterra.hu/distribution/attmts ... ntenna.pdf