Davis AeroCone Rain Collector w/Flat Base [6464]AeroCone Rain Collector with Flat Base The AeroCone rain collector reduces wind induced errors by providing a more aerodynamic path around the collector. Its contours are designed to streamline the airflow and reduce flow distortions. The design improves rain data accuracy in high wind situations where the horizontal wind velocity can cause under reporting. The enhanced design features don't stop with the outer shape: the inside of the rain collector