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How do you aim it at the other end? It's 100km away?

Same way you aim a Satellite dish to a satellite that's at least 35,000 km away.

GPS.

For whoever downvoted the GPS answer, RTM. Please do, it's highly informative and very cool technical and educational material. If you refuse, please insert the F into the appropriate abbreviation and start this paragraph from the beginning.

Please make sure your loops converge. I read and modified this paragraph 3,984 times and then crashed.

Not sufficient. Civilian NavStar/ GPS has a 95th percentile accuracy of 7.5 metres and a best-case of around 2 metres.

That's more than enough to miss by several dozen dish diameters at 100km.

Main alignment with GPS and then finetune to get maximum performance. At 100km the main signal lobe is quite large, so being off by a few dozen dish diameters isn't large enough of an error to not to be able to get started.

at 100km it doesn't matter. Even with a beam divergences of 0.5 degrees 7 meters is literally a piss in the ocean:

Look at the polar pattern here: http://dl.ubnt.com/datasheets/airmaxyagi/airMAX_900MHz_YAGI_...

more importantly you have to fine tune the alignment anyway.

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