During the 11 years that I was the CE there (1966-1977), I never even gave any thought to the possibility of coastal flooding reaching the transmitter. Then again, I never gave any thought to having 2 feet of sea water in my house either, which I just had.
When I was there the tower was series fed, and approaching a 1/2 wave length long had an unusually high base resistance in the order of 218 ohms, making for the big signal with rather poor ground conductivity. Now that the tower is grounded and apparently shunt fed, I'm curious as to what the base resistance is now.
Also, legend always had it that Harry Carman, the founder of the station in 1924 had buried numerous large metal items in the area to enhance the counterpoise. Many of the ground radials also extended out beyond the field towards Atlantic Avenue. Of course they were lost when the shopping center was constructed on the North side of the field.