Air Draft of Whitby 42

Varies. Typically I've seen 54' and that's what I was told when we purchased our boat. I've never measured it so I use 55' as a safe number when assessing if I can get under a bridge. And I've tickled the underside of a bridge with my antenna using that number.

Even if they all came out of the factory the same, years of owner changes to the expensive bits at the top may have changed that number. Best bet is to measure it!