Gravity on radio waves.

Here is some info:

http://www.nrao.edu/pr/2003/gravity/

It mentions measuring the bending of radio waves that passed jupiter when 
jupiter was in front of a quasar.

Apperently the radio waves are bend "slightly" whatever slighty means ;)

Now I wonder what would happen if many many many many many jupiters where in 
front of it.

Could the radio waves actually turn around like space probes ? and go the 
other direction ?

Or is this nearly impossible ?

Hmm then ofcourse black holes come to mind, which might do it or even suck 
them up ? ;) :)

Bye,
  Skybuck.