This is a very simple question and I'm sure if I had a bit more background knowledge, I could figure it out myself.
Let's say I have a 1/4 wave vertical antenna that is slightly too long, but it is impractical to cut shorter or fold back on itself. What do I need to add to raise the resonant frequency slightly higher (10 - 100kHz) without using a full-fledged tuner? To put it simply, I can't use a tuner. Can I do it with one or two components?
With electrically short antennas, I know I can add an inductor in series with the antenna to lower the resonant frequency, but how do I do the opposite?