Telemetry for APM

Hello, I am looking for a telemetry system for use in Europe. Looking for some system Iallow communication to a maximum distance of 25km. Do not know what will the best frequency but I can use any frequencies for digital modes in region 1 of the IARU.

I have doubts respect to the modules xbee 2.4GHz if there is a module more than 50mW or if possible use an amplifier for 2.4GHz used for wifi normally.

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