Lee's right, one line comments can get one into hot water quickly. For those who want to learn how antennas work, why resonance matters (or doesn't), what an antenna matching unit does, there's nothing like sitting down with a good book or two.? Here are a few introductory texts:
ARRL Handbook. The 2018 version has a section called "Antenna Systems and Propagation"
ARRL Antenna Handbook. The 2018 version, first four chapters, covers just about all of basic antenna theory.
Practical Antennas, Joe Carr. Chapter Five, "Antenna Fundamentals"
That's just three. There are lots of others. Pro tip: search Abebooks or a hamfest and look for older editions of the ARRL Antenna Handbook. They are inexpensive and the information as timely today as when written.??I picked up copies of the 1947 and 1960 editions for a couple of bucks each and both are great introductory texts, written for the radio amateur.
I won't list any of the radio amateur antenna experts that you can track down, for fear of offending someone with my choices, but if you start with the books above you will quickly build your own list. Be careful of random interweb sites before you have some grounding in theory; much out there is bunk and myth.
Of all the stuff a radio amateur can learn, nothing pays off quite as much as acquiring a good understanding of antenna theory and practice, at least in terms of contacts made or stations heard.? And nothing you do will make your working QCX perform better than figuring out how to put up a good antenna.
73 de bill K7WXW
bill K7WXW