Total posts : 45366
There are many ways to get there, but the general idea is to have an inductor of 300 – 400 uH to match your short antenna to the transmitter. The taps on the SSTRAN design are one way to adjust the coil inductance – some designs use solder taps, sliding iron power cores, even a second, smaller coil inside the larger coil.
It’s definitely not an exact science and very much dependent on your local factors.
Here are some earlier posts and info items