Simon  could be right ...

I would use Simon's  WiMax .. First install masts all the way to Turkana ...  no wait .. First get power lines to Turkana (600km) so that they can be used to power the repeater base stations and the wimax active devices .. Employ jammaz to take care of the stations.. and equipment .. and voila .. there you have it...

Why get obsolete vsat of about USD 8,000 when one can easily get a WiMax solution with about 1 million USD

.. ... ama aje Simon ? ..its a no brainer ..