10X 100mm 2.4G Receiver Antenna IPEX Port For FRSKY JR
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Those antennas are pretty short, exactly 10cm, including the ipex connector. From those 10cm, consider that 3 cm are the exposed wire, if you intend to make those into dipoles, also consider extra 3cm, so you will be left with only 4 cm length wires from the receiver to the place you need to take out of the frame. If you want to have more room, then get the 15cm version. This cable with this connector will fit the Flysky X6B receiver.
Very nice easy to change the anteanna on anything that has U-fl ( Ipex) connector. It is a good quality standard antenna. Just keep in mind that these come with the old IPEX connecters. FrSky has changed to a smaller type on the new connectors so these do not fit the latest models of the X4R-SB.