Now that we're talking about big telescopes I can mention LOFAR: http://en.wikipedia.org/wiki/LOFAR http://en.wikipedia.org/wiki/LOFAR It's interesting in that

Now that we're talking about big telescopes I can mention LOFAR: http://en.wikipedia.org/wiki/LOFAR http://en.wikipedia.org/wiki/LOFAR It's interesting in that it consists of 15.000 small antennas and they are using computers to combine the signals which effectively gives you a 1 square kilometer "dish".