How to make 868MHz or 915MHz dipole antennas for FrSky R9 or TBS Crossfire receivers

The correct length of 868/915MHz antennas used by FrSky R9 and TBS Crossfire is:

  • for FCC 915MHz it is 75mm
  • for EU/LBT 868MHz it is 80mm

From time to time FrSky has a big problem with cutting their antennas to a correct length. Good thing, you can make your own TBS Crossfire RX antennas for cheap!

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