[Argus25]

One thing that might be worth noting;

The impedance of space or a vacuum , said to be 377 ohms and cited in the equations in post # 5 on the other thread, is the wave impedance in the far field from an antenna and is the ratio of the electric field E in volts per meter, to the magnetic field H in amps per meter.

However, in the near field to a transmitting antenna (and all pantry transmitters and their listening radios work in the near field because of the transmitted wavelength, say 300m is much longer than the geometry of a house) the impedance is not necessarily 377 Ohms.

For a whip antenna, the near field is largely electric in nature near the antenna with a small magnetic field component, so the E to H ratio or wave impedance there is high, but for a magnetic or loop antenna the magnetic field is dominant and the electric field low and the wave impedance lower.

Most likely it would be the case then, that the loop antenna would be better for pantry transmitters if the receiving radios had ferrite rods, such as transistor radios, but for valve radios with a wire antenna, then a wire transmitting antenna would be better. That would be an interesting experiment.

In the far field where the E to H ratio has settled on 377 ohms, it would likely make little difference and probably one could not tell whether the transmitted signal originated from a dipole antenna or a magnetic loop.