"RB" wrote
Longwire antenna. Coil in parallel with var cap for matching circuit.

What is the likely Z range such a circuit might match?
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Easy! Just say how long is the wire, at what height, at what frequency, and
the impedance of the ground connection, and lo-and-behold, all will be
revealed by a calculation which will involve arithmetic. And arithmetic is
an unwelcome subject on this newsgroup.

Not that the resulting value of Z = X + jY will be of much use to you. What
plans do you have to do with it?

In a fraction of the time expended in vague questions and obtaining even
more vague replies, why not erect the wire, as you propose, and connect the
capacitor in parallel to see what happens.

But you may save even more time by connecting the capacitor in series.

Good luck with your experiments.
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Reg.