Any point in betwen that could be used as repeaters???? A place like a mountain top, where you could setup a small post with antennaes, and a repeater could give you the range to use radio links.
Around the Philipines there are some people that do up to four hops, from island to island.
Look for Tsunami radios, they work on the 2.4 GHZ range.
Best regards.
Wilson Boyrie.