ACR AIS-A3200 VHF Marine Antenna is a 3 1/2 foot compact stainless steel whip antenna is specifically designed for AIS equipment. The antenna's features include a 6 dB gain, mounting bracket and a 15 foot cable terminated with a PL259 connector. In order to directly connect this antenna to an AIS receiver you will need the PL259 to BNC Adapter. If you are connecting this to the VHF Antenna Splitter then no additional adapter is required.