Clearance of SM including VHF antennas

Paul Osterberg

The vertical clearances according to my old brochure is 20 m for our SM #259, does anyone know what clearence required to pass under a bridge with the standard supplied VHF antennas at the top of the mast?
We would like to pass under the bridges between Nassau and Paradise Island and the bridge clearence is 21 m
Paul on S/Y Kerpa SM#259

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