G5RV 102 ft. dipole with 28 ft. 300 ohm matching section

The following chart shows the optimum length for the matching section per HF band according to EZNEC. It's obvious why the ~30 foot length works well on 80m, 40m, 20m, 12m, and not bad on 15m. If some method is devised to vary the length of the 300 ohm series matching section on the G5RV, it can be made to work well on all HF bands.