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Maybe it is just my opinion but getting highly directional is self defeating. A 24db antenna has about an 8 degree beam spread with a fast roll off outside that. If the boat drifts 4 degrees the signal drops by half. A few more and it dies all together. If you are pushing for maximum range it will die even sooner.
True there are a number of anchorages in the Caribbean with fairly constant easterlies but there are many more sheltered where it is common for boats to be drifting about their anchors in all directions.
You also have to remember that wifi is a two way street. While a higher ERP and receiver sensitivity can increase range you are ultimately limited by the capabilities of the weaker station.
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