5.5dBi Rubber Duck Omni APXtender. (SMA) The Low Cost 5.5dBi Rubber Duck Antenna can be used to replace the original 2.2dbi rubber duck antenna which comes standard on many wireless equipment. It is only 7.75" in length and is available with SMA, Reverse Polarity SMA, Reverse Polarity TNC and N Male connectors. Other connector configurations are available upon request.