wrote in message
oups.com...
The loops respond to the magnetic portion of the wave, while most noise
is electrical.

In most loop applications, they are much shorter than a wavelength. At
least for shortwave.
I reread the original post and am convinced the poster is referring to a
horizontal wire loop of large dimanesions- i.e. not fractional wavelength.
I personally have a homebrew 7' shielded loop with wideband preamp on a
short tower some 200' from my home- if the noise source is not in the near
field, these antennas have no noise advantage except in the null directions.
See:
http://www.w8ji.com/magnetic_receiving_loops.htm

Dale W4OP