Hi
At the TED 2010 conference (click here for program)held in Long Beach California, SETI pioneer Frank Drake suggested placing a spacecraft 550 astronomical units from the Earth to listen for radio signals.
At that distance "...electromagnetic signals from planets orbiting distant stars would be focused by the gravitational lensing effect of our Sun, making them, in theory, more easily detected."
Source: New Scientist. 20 Feb 2010 page 5.
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