GPS.

emilw · on Nov 1, 2015

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.

jonpaine · on Nov 2, 2015

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

dingaling · on Nov 2, 2015

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.

amazon_not · on Nov 2, 2015

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.

KaiserPro · on Nov 2, 2015

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.