u-blox ANN-MB
Setup

Fig. 1: VRTK2 with ANN-MB
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Fig. 2: ANN-MB antenna
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Fig. 3: Agilex setup with ANN-MB antenna
Antenna phase center:

Antenna reference point (ARP) location

Test results
Conclusions
Equal or better performance than the reference.
Good alternative, esp. for customers looking for a low-profile antenna.
** Requires proper mounting (GP).