Detecting 2.4 GHz signals using oscilloscope
Not with just that oscilloscope.  You would need something with at least 2.4 GHz of bandwidth in order to see anything.  

However, it is possible to combine several instruments.  One option would be to take a spectrum analyzer, put it in zero span, and feed the video out connection to an oscilloscope.  Another option would be to use a fast power meter (peak power meter) or crystal/diode detector and feed that to the scope.