sounds like there is some thought about rain run down then
Although the 3200 and 3300 have different angles for their radar arch, I will mention my case.
I have spent some time to understand some tendencies of run off to sometimes curl around the radar arch while it is raining. I do hope to make some improvements with my canopy within a year to handle this. I had started a thread for it a few months ago. My original attempt of adding some weather stripping had not addressed it fully and will probably need to go with u-shaped tubing / splines to keep all runoff along the arch.