Richard Harrison wrote:
. . .
From researching susceptibility of antennas to noise I came across a
statement interesting to me in Terman`s 1955 opus on page 929:

"----a loop antenna responds much less to the electric induction field
than does a simple wire antenna of comparable intercept area. This is of
importance because electric induction fields predominate in the man-made
noise that causes disturbances in radio receivers, and this explains in
part the popularity of loop antennas in broadcast receivers."

Like so many bons mots lifted from Terman, we have to use a bit of care
in extending it to everyday amateur applications.

A very small loop responds less strongly to the electric field than a
very small dipole only within a fraction of a wavelength of the antenna.
Beyond that, it actually responds more strongly to the electric field
than the dipole does. So at HF, for example, it would be helpful only in
rejecting electric field noise being radiated within a few feet of the
antenna.

Roy Lewallen, W7EL