Karlist,
With the BB60C, maximum sensitivity is achieved at 55 dBuV maximum input level, or -50 dBm maximum input level.
As far as measurements being 20 dB off… is the antenna the same distance as in your test site, or did you compensate readings for distance to DUT? Did you factor in any preamplifiers or cables used? Using a chamber without absorber will skew your results as well, but not by 20 dB… however, using a test distance of 3 meters instead of 30 meters would give you a 20 dB offset.
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