Roof rack wind noise

Does anyone know how to fix the wind noise caused from the wind deflector vibrating against the roof? It sounds like a "clicking" noise (very irritating). My old Xterra only did this once in a while at speeds over 70mph. My new 2003 now does it at 20mph.

Please delete your 2 posts in this section, and post only in one section only. This section is for:
"Share your techniques with other owners" not asking questions.