Not a direct answer to your question ... but may help
I use broadband WiFi access with an external antenna for my laptop. Although many wireless routers are encrypted, invariably in or near populated areas you usually will find one that is 'open' and not encrypted; hence, open access to the internet.Along the coast of the NorthEast US I can usually 'connect' with such an antenna within 1 or 1-1/2 miles of the coastline. In most busy 'ports' frequented by sailors if you cant find open access, you can often find a 'subscription' (1 or 2 days) connection. All of these connections through open or unprotected wireless routers are high speed. Obviously such connections are not as reliable as an air card, etc. but the price is 'right'. http://www.radiolabs.com/products/wireless/wireless-marine-antenna.phphttp://www.wi-fihotspotlist.com/http://www.wififreespot.com/http://www.jiwire.com/search-hotspot-locations.htmetc. etc. etc.