Just for the record, Hank, I've had an Isotron antenna and it works just
like a very expensive dummy load. Provides a good SWR match but doesn't
radiate worth a darn, and it's deaf as a post for receive.

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But that's exactly how it's supposed to work although the manufacturer
doesn't mention it in his specification.

And as every good amateur knows, the most important characteristic of any
antenna is the ubiquitous SWR. The ARRL and RSGB handbooks attach much
space to it.