Boat DAB+ Radio Kit Waterproof Marine Stereo Receiver and Speakers and Antenna By admin in boat November 21, 2023 Application:Boat, yacht, SPA, swimming pool, ATV, UTV. Antenna Length: 13.3. 1PCS x Marine Antenna. 1Pairs x Marine Speakers. 1PCS x Wire Cable. Frequency Response: 120Hz – 20kHz.