Overall I found the loops working better, and provided deeper nulls.

The depth of nulls depends on (1) the skill of the operator, since a two-dimensional search
is necessary to find the null; (2) the bandspread of the controls - for a hugely deep null,
you're dealing with fractions of fractions of degrees in steering, and the control can easily
be too clumsy at that fine adjustment; (3) the amount of E-field picked up by the loop, or
H-field picked up by the whip : the ``other'' field is 90 degrees out of phase and cannot be
cancelled if it leaks in. With a skilled operator, (3) is always the limit.

Oh and (4), if it's skywave, the actual angle of arrival varies, and may make nulling
impossible for any phased setup that depends on steering a first-order null onto a target.

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