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It should have read 85 feet, and, yes, the antenna is isolated. Today I added a wooden dowel - Ash shovel handle - between the antenna and the  mast.


I also tested the coax with a dummy load. It had a 1.1 or 1.0 SWR with from R52/X0 to R50/X0 across the 27 Mhz spectrum.

The dummy load was the same on the electrical 1/2ƛ  jumper.