Ian Jackson wrote in
news
The question is, at which end of the feeder is the most absolute power
lost per unit length?

You might find Fig 10 at
http://vk1od.net/transmissionline/VSWR/displacement.htm interesting. It
is a plot of the power along a length of mismatched line.

The plot doesn't answer your question directly, but the slope of the line
in Fig 10 is the answer to your question for the scenario modelled. The
slope is steepest around the current maximum nearest the source.

Fig 9 is interesting as it shows the loss for a mismatched line can dip
below the loss line for VSWR=1.

The thing that becomes apparent from Fig 9 is that the common practice of
doubling loss for double the line length works for the VSWR=1 case, but
not for the general case. As a mismatched line is lengthed, the
*increased* loss for each *extra* metre of length *approaches* the
matched line loss and the line length approaches infinity.

Owen