On the ISM300Fx how should I connect my antenna?

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The RF in port on the ISM300 connects to the antenna (via the U.fl) or pad 1 and the input of the GPS. It is important to add the external LC circuit shown in the reference schematic on the specification because this will prevent the loss of GPS signal going into your power supply. One part we have used is the inductor L3 (33 nH is 0603HP-33NXGLW)