GNSS Multi-Band L1/L2 Helical Antenna (SMA) BT-560

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The figure given here says +/- 2mm https://cdn.sparkfun.com/assets/7/3/e/8 … asheet.pdf but there’s more info about the performance of the coupler here https://cdn.sparkfun.com/assets/1/b/3/f … 00P03S.pdf