This is a replacement 2.4GHz antenna for FrSky receivers like the popular X4R-SB and D4R-II. It uses a micro U.FL connector to make replacement a snap. We do advise that you hot glue or epoxy the connector in place to be sure it doesn't pop off. This is the newer style W.FL connector. Production changed around August 2016. The older U.FL connector has a diameter of about 3mm. The newer W.FL connector has a diameter of about 2mm and uses a thinner wire.
150mm or 15cm long
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Complete builds using this part: