vertical clearance

[tmorgan]

I read somwhere that the mast height of a Sun Cat was 18.5 feet.  What is the vertical clearance you need when the boat is in the water to go uner a bridge?
thanks

[Craig Weis]

To sneak under a bridge with an 18'-5" mast could be as little as 20 foot unless a radio antenna of about 30 " is added to the mast. How about tides as in Fl.