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Hi Mickoking & Adam,
Ive scanned a photo of the Antennas,(attd. herewith) There were at this time 4 of them 2 x 12 foot and the 2 x 20 foot stressed parabolics, I built the 12 foot ones to test the idea, they worked so well I went bigger and built the 20 footers, An interferometer is not difficult to build, and recording is quite easy, but space for large antennas is sometimes hard to find, They were arranged to do a "Drift Scan" using the earths rotation, and were only moved in declanation, and yes any object in space can be recorded (that emits continuum or thermal radiation), The vertical defelections are the strength of the sources, the time between sources = distance, RA time is marked at the botton of the chart, Detecting Galactic Neutral Hydrogen at 1420.405 Mhz. is much easier and requires less equipment,
If you are interested I can go into this a depth, if you think its the right forum.

regards...................Jim