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Hi, A while back I bought a copy of 'The radio sky and how to observe it' and finally got round to building the aerial for detecting SIDs. I have had it running this afternoon and have been logging the results. I think it is all working but one thing I have noticed is that the signal to noise ratio (vertical axis) is pretty poor. Does anyone have an idea about the point at which the ratio becomes too low to yield meaningful results? Thanks, Dave