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The G5RV needs a tuner. In fact, it needs a tuner with a wide range. Some Yaesu HF rigs with autotuners specifically say they can't tune one.
I don't and haven't ever liked this antenna. It uses the vertical window line as a radiator on the bands which defeats the purpose of a dipole. That also restricts how it's installed, as the ladder line needs to be vertical for "best" operation, and that also needs to be well away from anything metallic. You'll also want to install it at least 1/4 wavelength above the ground for the lowest band you'll use.
My advice is to get an autotuner, a manual tuner, or construct/buy a multiband fan dipole or OCFD, in order of cost. At this stage, the autotuner would be my recommendation because it's easy to damage an HF rig and it'll let you experiment with other antenna types.
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The window line section is used as a matching section, not as a radiator. It's balanced and not a radiator.
But correct in that the G5RV does need a tuner.
I am a big fan of OCFDs, but regardless of all the advertising hype, it needs a tuner.
A multiband or fan dipole can work a lot of bands, but it can do it better with a tuner. My fan dipole has just three pairs of elements, 75 meters (tuned about 3.900 mhz), 40 meters (tuned about 7.180 mhz), and 20 meters (tuned about 14.200 mhz). But I can also work, with a tuner, 60, 30, 17, 15, and 10 meters. That's 8 bands, not just three. I could have done the same with an OCFD and a lot less wire.
I can highly recommend the LDG auto tuners. They tune fast and are very reliable.