Whistler SWRA-36 Pro-3600 Laser-Radar Detector Antenna Module Accessory integrates with the Whistler Pro 3600 radar detector and provides a secondary antenna to enhance the sensitivity to both radar and laser. This Whistler SWRA-36 antenna is designed to be installed on the rear of your vehicle to improve sensitivity from behind; a weaker area for most radar detectors. The SWRA-36 is very similar to the antenna included with the Pro 3600, but without the temperature sensor. For Pro-3600Rear antenna Provides additional laser-radar detection from the rear and does not include a temperature probe.