Furuno DRS4DL Radome Radar Sensor. DRS4DL is a new compact 19" radome radar antenna for use with the NavNet TZtouch/TZtouch2 series. A 4kW Radar with an effective range of 36nm that offers simple installation without the need to purchase a separate power supply unit. Ultra High Definition (UHD(TM)) Digital Radar offers crystal clear, noise-free target presentation with automatic real-time digital signal processing.