Multi-band Dipole -- ladder line 96 ft vs 91 ft

Following another suggestion for tweaking my dipole, I added 5 ft to the 91 ft 450-ohm ladder line and used my antenna analyzer to compare the results with what I obtained previously. The two graphs below compare what the auto-tuner was able to achieve on selected frequencies on the 80 m and 40 m bands. SWR readings are what my transceiver reported after the tuner had reached its best match. Click on each image for the full size view.

The 80 m band view shows that the longer ladder line feed results in lower SWR on the frequencies below 3.9 MHz.

The 40 m band view shows mixed results, but all readings are below SWR = 2.0.

The next two graphs compare the impedance magnitude vs frequency for the same two feed line cases on the 80 m and 40 m bands.

The 80 m band view shows that the impedance curve is shifted lower in frequency for the longer feed line.

The 40 m band view shows lower impedance at each frequency for the longer feed line.

I'm reviewing the SWR data measured by the analyzer for these same cases. The numbers become erratic at SWR above 10. Below is the graph for the 80 m band. For the 40 m band, all data points are above SWR = 38 and are erratic. These values are probably beyond the valid range for the analyzer hardware.