RHF wrote:

...
"n" - practically speaking {in practice} there is a
difference between between hams and swls ~ RHF
.
.


Simply a pipe dream ...

The same antenna which transmits the MOST EFFICIENT signal possible,
will also receive the signal the MOST EFFICIENTLY (given measuring
parameters remain the same for both modes, i.e., T/R) ... smaller gauge
components with far less power ratings can be used for receiving
antennas--that is the most important difference, and actually, the only
important one(s.)

However, I can see how some would come the the conclusion(s) you have.
In cheap receivers, you really don't know what ohm impedance the antenna
jack REALLY is. It may say 50 ohms and be 100, 200 ... 500 etc. Least,
that has been my experience ... when you get into professional gear,
costing thousands, they can take the time and aim for accuracy.

Regards,
JS