Roy Lewallen wrote:
The only way to prevent this is to completely shield
the dummy load and transition to the feedline, and have no seams, holes,
or cracks which could let any current get from the inside to the outside.

A good example of such a dummy load is the Bird Termaline
Coaxial Resistor. I've got model 8020.
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73, Cecil http://www.w5dxp.com