AMSAT-DL has succeeded in bouncing a 2.4 GHz signal off of Venus and receiving it back here on earth. That’s a 31 million mile path length! AMSAT-DL used this as a test to prove the radio techniques they will need for their planned P5-A amateur Mars satellite.
Read more at Make Magazine.
I read about that on the net! I can’t believe more people aren’t talking about it. I want to learn more about their Mars mission.