Cecil Moore wrote:
I think Roger is talking about the phase shift at a reflection
point. If ZL Z0, the current reverses phase, i.e.
It = |If| - |Ir| = 0. If ZL Z0, the voltage reverses phase,
i.e. Vt = |Vf| - |Vf| = 0

Left out a few words - should be:

It = |If| - |Ir| = 0 at an open-circuit.

Vt = |Vf| - |Vr| = 0 at a short-circuit.
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73, Cecil http://www.w5dxp.com