It's a waterfall plot of an all sky scan of The Milky Way at 1420Mhz using the following equipment and software. Just finished yesterday, took several weeks running 24/7
see http://www.gco.org.au/SRTInfo/srt.html
I put the SRT to a fixed position looking into the sky, and let it stay there for a couple of days to look for variations of the receiver level with time to see if there is a variation with ambient temperature. Since then I have not seen a clear relation of the signal to daily temperature rise/fall, I suspect that I might not find any, but I'd like to be sure, so will do some further investigation. I'll get back to you when I have any further data.