If you're hearing a whistling noise coming from your roof basket, there are a few things you can do to help mitigate the noise. First, check to see if the wind deflector is properly installed and secured. If not, re-install it according to the manufacturer's instructions. Next, try adding some weatherstripping around the edge of the basket where it meets the roof. This will help create a tighter seal and reduce the amount of air flow that can cause whistling. Finally, make sure that all straps and bolts are tightened down securely. Loose components can also cause rattling and whistling noises. If you've tried these tips and the noise persists, contact the manufacturer for further troubleshooting assistance.