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CC110L: On-Board PCB Antenna Design for 865 MHz & 868 MHz with 15 km Rang

Part Number: CC110L
Other Parts Discussed in Thread: CC-ANTENNA-DK2

Tool/software:

Hello,
We are currently in the process of developing a solution that requires a reliable PCB antenna for communication in the 865 MHz to 868 MHz frequency range. 
To meet our project requirements, we are looking for an "on-board PCB antenna design" that can achieve a communication range of 15 km.
Could you kindly share with us the design files or specifications for such an antenna? If any modifications or optimizations are required to meet this range, we would appreciate your recommendations.
Looking forward to your prompt response and support.