[vbtemp]

These are part of NASA's Deep Space Network, used to communicate with the fleet of interplanetary spacecraft (as well as plenty of satellites and the ISS). The you mentioned the three largest ones, each with a 70 meter dish.

[mturmon]

And here's the pic:

http://deepspace.jpl.nasa.gov/dsn/images/picture_70_bw_lg.jp...

[jules]

Now that we're talking about big telescopes I can mention 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".