In article ,
Ron Hardin wrote:

Daytime reception is a problem of hearing weak signals. A MW loop
like the Terk loop is an impedance matcher, letting almost any radio
hear down to the propagating noise level, beyond which you cannot
go without a large antenna having forward gain, with any radio.

snip

I still don't understand what you mean by loop being an "impedance
matcher." You posted this in the past and when I ask about it you are
silent.

The radio already has a loop type antenna, which is collapsed in size
due to the magnetic permeability of the ferrite core it is wound on. The
external loop does not have this ferrite core, which causes it to be
larger in size. The air loops larger cross sectional area allows it to
generate more current in itself for the same EM wave energy passing
through it.

The RF current circulating in the tuned air loop in turn generates a
magnetic field that the radios core loop can pick up or a pickup air
loop inside the larger tuned air loop magnetically couples to the large
loop and a coax from it conducts the signal to a jack on the radio.

--
Telamon
Ventura, California