The Great Asian Space Race:

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If you want to have a single continuous dish, then yes, you need a large space. There's no real need for it, though, when you can have a whole bunch of small reflectors focusing the beam onto a single point. Sort of like this: http://www.youtube.com/watch?v=tebn2rs8QHk

A system like that would work fine on top of buildings - it would take a lot of maintenance, especially during the storm season, but you could just have the mirrors rigged up with sensors and let a computer handle the focusing.
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