Paolo,
In my opinion, I agree with the "null" theory. I did some work in the
'70's with a digital RG system operating at an assigned experimental
frequency of 939+mHz. At this frequency, "line of sight" is extremely
important, unlike lower frequency AM/FM radio signals, which often "bend"
over the earth's curvature. We also experienced problems with isolated
nulls.
One of two things could have happened. She could have stepped into a
null due to a blocked line of sight (and no strong refleced signal), or
a null caused by an out-of-phase reflected signal.
George
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