A Half wave antenna has a high impedance feed point. This can be matched using a 1/4 wave stub matching section and converts the 40m vertical into an L-shaped 20m J-Pole antenna. The 300 ohm feeder used for this purpose must be kept away from the ground.
Some observations on the Yaesu FT-817 5W portable HF VHF UHF transceiver with some pictures and movies
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