Peter, VK3YE, has a very neat portable setup that includes a nicely beaten up FT817 and a pocket sized L-Match antenna tuner that seems to work very well for him. He described it on his site and in a video and there are many descriptions of this simple circuit. I built one for QRP use in a small plastic box.
My version allows the capacitance to be switched between the input and output. (Click to enlarge).
So far I've tested with a MiniVNA plugged in to my (currently half down) off centre fed dipole and it certainly changes the reactance wildly when adjusted.
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