And it varies, according to what boat you are communicating with. Somebody's CC with a 4' antenna is not going to work as well as a big sportfisherman with the top of the attenna over 25' off the water, it is all pretty much line of sight. Also it is better some days than others. I haven't talked to them, but I can sometimes hear boats fishing the Chesapeake Bay Bridge Tunnel from New Point Comfort which is more than 20 NM. The top of my antenna is maybe 14' off the water, and I believe the boats I hear are big ones.
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