Jeff Liebermann wrote in
:

Yes. For purposes of calculations and under most conditions, the
pattern is the same for transmit and receive for most antennas.



Works for me. Thanks. Point taken about the other examples though, your
descriptions remind me of problems with badly mismatched laser optics. Also,
though I'm not sure how close this metaphor is regarding coupling
efficiencies, a loudspeaker and microphone have reciprocality, as John S
names it, but they have a hard time doing each other's job. (Though as a kid
I preferred two small speakers and a long mains flex cable to the tin cans
and string I'd read of in some book).