I'm attempting to measure some very low amplitude signals on a circuit board and ambient noise is a huge problem. The probe I am using is very directional, but still picks up quite a bit of noise. I am curious if there is some way to cancel the noise signal only leaving the signal of interest. For example, by using a second omnidirectional probe in close proximity to the directional probe in order to pick up a common noise signal, then inverting the waveform on the scope and adding the two waveforms to cancel out the noise, essentially leaving only the differential signal (signal of interest). Will this work? FYI, the signal of interest has a data rate of about 40 Mbps.