Radio Astronomy and Imaging So, I've been starting to investigate radio astronomy, and am wondering about if certain things are possible from an amateur standpoint. I was looking at this powerpoint(that discusses building a tiny radio telescope), http://nightsky.jpl.nasa.gov/download-redirect.cfm?Doc_ID=347&amp;Doc_Filename=IBTcom1%2Eppt .

On Slides 11, 12, and 13, it shows various radio emissions overlayed on the orion constellation. As well as Slide 17 and 18.

I'm wondering, is the data acquired in these images, doable from an amateur standpoint? From previous research I think I can build some detection devices for the Hydrogen Line emission(1420Mhz/21cm line), and that could lead to data(per my initial/basic understanding)  that's shown in image 1. Am I right in that assumption, and are the other emissions or data doable from an amateur standpoint?
There are tons a amateur radio astronomy clubs and groups.  Radio Astronomy was basically started by an amateur named Grote Reber, where he basically did the experiment that you are pondering to do in 1937 in his backyard in Wheaton, Illinois.  You can visit that exact instrument at the NRAO facility in Green Bank, West Virginia.  It was named a National Historic Landmark in 1989.

Just Google Amateur Radio Astronomy

https://en.wikipedia.org/wiki/Reber_Radio_Telescope

http://www.nrao.edu/whatisra/hist_reber.shtml