John Smith wrote:
But on a short run, lower frequency, there is not enough of the line to make
a large effect.

For a 1/2WL line, as was the example, the impedance is transformed
around one shallow spiral on the Smith Chart. For long, lossy
runs, the SWR "circle" becomes multiple spirals that spiral inward
toward Z0 which is in the center of the Smith Chart.

For a short relatively lossless run of feedline, if the SWR is not
1:1, the impedance seen by the transmitter can never be Z0.
--
73, Cecil, W5DXP