Radio Astronomy

Thanks to Marc, ON3LAW, I've visited a very interesting Astronomy event and had the chance to look through some nice and large telescopes.

Being a Radio Amateur of course I was curious if anybody was doing any observations based on radio waves
( ... Or using radio-waves of lower frequency that light :-) )

To my surprise however I've learned that despite some very passionate Amateur Astronomers present at this event, nobody there did any Radio Astronomy.