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Paying $400 for a wifi box that doesn't publish power or receive figures is crazy when you can buy a proven 200mw EUB-362 with 92db receive that is the size of a pack of cigarettes and a good 9db antenna for under $100. If you are looking for a more permanent installation an EOC 3220EXT from Engenius with a 9db marine antenna cost Maybe $220. It is a 6x6x2 waterproof 2 lb box that puts out 400mw with 91db receive. Installed at the masthead with an Ethernet cable to the nav station will give you 11Mbs at 6 to 8 miles from a good shore signal and a full 54Mbs at a mile or more from a cheap AP in some one's vacation villa. (of which there are many left unsecured scattered all over the Caribbean.)
With any Wifi installation there are two unalterable rules when going for range: Keep the coax run as short as possible. at 2.4GHz even the best 1/4" diameter coax will eat half the signal every 23'. Get the antenna as high as possible to minimize obstructions within the Fresnel zone.
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