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FEATHER_RANGE[2] defines a region of "overlapping" UV spacings over which the ratio of LOWres and HIGHres visibilities can be checked. If the flux scale is correct, this ratio should be 1. FEATHER_RANGE defaults to FEATHER_RADIUS/1.15 and FEATHER_RADIUS*1.15.
The computed ratio is only a guide, and not used in the algorithm. A proper definition of FEATHER_RANGE requires knowledge of the initial UV coverage of the HIGHres and LOWres data sets. If FEATHER_RANGE is too large, the computed ratio has no real meaning.