FrSKY 150mm Rx antenna - old connector (2pcs)

A pair of replacement whisker antenna. This is the same antenna that the props chopped off your receiver.  Fits the X4R-SB, D4R-II, S6R etc.
The active element in the antenna is the unshielded part at the tip - if you have lost any of that portion of the antenna it's no longer tuned to 2.4GHz and should be replaced.

This is the older style U.FL connector.  Production changed around August 2016.  The older connector has a diameter of ~3mm.  The newer IPEX4/W.FL connector has a diameter of ~2mm and uses a thinner wire.

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