A couple of suggestions:
1) The MS2000 is not perfectly omnidirectional. Have you tried rotating it to see if anything changes?
2) Due to scattering/reflections/blockage of nearby objects, hot spots turn up where you don't expect. I'd bet that's the case with your friend. Moving your antenna might help in a similar way.
If I were starting fresh, I'd find a bow-tie array without a reflecting screen, since your stations are in two groups roughly 180 degrees from each other. There's a home-brew solution that works well with high-VHF/UHF (NOT the design you find in youtube videos.)
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