The Stoddart Radio Company which specialized in EMI/RFI "meters" covering from
Hz (!), through 18 Ghz for many, many years, included a 1" diameter loop with
their "Noise Meters".
It was very useful when you needed to get close.
The U.S. Navy bought many of their units. One in particular, the AN/URM-6 used
steel covered loops of 3' in diameter, 6" in diameter, and finally 1" in
I have several models of their receivers and the loops here.
A 3" loop for our purposes would be almost as useful as Stoddart's 1" loop.
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