As we soon learn here at Part 15 School a loading coil can bring a 3-meter vertical antenna to resonance.
What we know is that a particular number of turns-of-wire around a round, square or triangular coil form wired in series between the transmitter and antenna achieves resonance, thereby extending the signal range.
Certain variables determine the actual length of coil wire, such as thickness of wire, space between winds across the surface of the coil, and diameter of the coil.
Let's imagine that a single coil reaches resonance with 50-feet of wire.
But we decide to have three coils connected in parrallel. Doing so would require each coil to be wound with 150-feet of wire. Am I right?
Big question: why would we do that?
Answer: Because we wonder if it would perform better than using one coil alone.
What do we know now: We don't know if it would matter. But thinking about it makes one curious.
Such is the mental activity of a part 15er during a Labor Day weekend.