Chris Jewell wrote:
1. Basically correct?

In addition to the obviously lower matched line losses, a
high-Z line has an additional advantage - lower average
SWRs with non-resonant antennas. For instance, a 5000 ohm
full-wave dipole will have an SWR of 100:1 using 50 ohm coax.
It will have an SWR of 8.3:1 using 600 ohm open-wire line.
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73, Cecil http://www.w5dxp.com