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I interprete that this is one end of a point-to-point link, with highly directional parabolic antenna(s).
Being close enough, the sidelobes and maybe even leakage of the feeder are (possibly) detectable. However, moving the stumbler just a little may vary the signal from zero to descent and back to zero. Nothing reliable even when on it's best, don't count on it.
But another interesting aspect: The stumbler might receive signal from the other end of that point-to-point link due to reflections from the antenna structure. Depending who is the access point and who is the client -- or maybe both in ad-hoc -- you either see the one or another. Usually the signal level of such reflected remote transmission would be too low, but if the link has solid margins, maybe...
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