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Hi, @simon88.
Thank you for interest. C9, C11 and R10 forms a circuit which is typically called a Pi matching network, in this case to match the impedance of the RF module (*typically 50 Ohms) to the antenna (can vary significantly depending on the quality).
If you have a well matched antenna then you can simply short R10 with 0 Ohm resistor and leave others unpopulated.
Otherwise, you need a Vector Network Analyzer (VNA) to properly measure the impedance of the antenna while the device is installed on its final enclosure and use online calculator like this one to calculate the exact inductor and capacitor values.
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@azerimaker thanks a lot for this very useful answer :)
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