Just came up the Intracoastal Waterway from Fernandina Beach to Norfolk on my Cambria 44 with a mast height of 62 1.5 + 10 nav light = 62 11.5 to the top of the mast's fixed portion.
There is a 36" VHF antenna
also mounted on the mast, which means 62 1.5 + 36 antenna
= 65 1.5" total mast height.
The only bridge that the VHF antenna hit was the infamous Lester Wilkerson bridge above Bellhaven, NC (located at the start of the Alligator River/Pungo River Cut, reported to be only 64 feet high). The bridge just dinged the top portion of the VHF antenna. There is probably some rounding in the 64' height in my opinion - probably the bridge a few inches more than 64,' at least on that day.
The River Forest Marina in Bellhaven reported that the tide boards on that bridge are accurate.
There is very little tide change there, with the major influence being the wind
. When we came through the current
in the Cut was flowing northeast to southwest.