Check into a company called Clear/Clearwire. It is not a marine device but it is an internet and phone service provider with a plug and play device that works at home or boat. Home phone rings miles off shore while pumping wireless throughout your boat (max 5 laptops). I have streamed youtube 10 miles off LI, then surfed the web on the freeway home. Great service for sailors.
They just launched Nov 1 in NYC, Has anyone used this yet?
I believe they use WiMax, a not yet widely adopted wireless technology working to the 802.16m protocol.
Like the 802.11n protocol used in the latest implementation of WiFi, it uses a table of different modulation/coding to ramp up/down the available speed as signal varies. MIMO (multiple input/output) is also supported by both protocols utilising two or more antenna's to provide multiple signal paths in order to increase bandwidth.
I have hired & used WiMax hardware in Dutch Saint Martin. Pre-configured, it provided plug'n play Internet LAN connection to my laptop & worked well over considerably greater range than conventional WiFi despite the device with small integral antenna being inside my boat. Although bandwidth/throughput was modest, it was very consistent at my remote anchored location. Given the large number of mega-yachts there, conventional WiFi channels are totally oversubscribed hence the reason a local provider offered this alternative.
I was told as well as greater range it will work under near line of sight conditions unlike WiFi, & I have no reason to doubt this. To quote a WISP:
"5GHz goes through air.
2.4GHz goes through one tree.
900MHz goes through two trees.
Chainsaws go through 3+ trees"
I think at the moment 40Mbps is achievable although the standard allows for much higher so it may be the future.