Antenna Basics Begin Here. This article explains the purpose and function of an antenna. There are diagrams that show exactly what is happening inside and outside an antenna and the relationship with the radio waves. Very interesting.

Radio Spectrum Information,  explains what your antenna is looking for in a world full of waves.

More Basics

Antenna Fundamentals

Television channel frequencies for most of the world. Currently in many countries certain television frequencies are being reallocated to the mobile phone industry to support their growth. The changes may or may not be included in this document. 

Dipole Antennas The Grandfather of all antennas and still essential for VHF TV reception. Nearly all antennas are derived from this simple beginning.

A very informative glossary of antenna terms.

ANTENNA RESEARCH AND DEVELOPMENT.     This group of antenna builders and engineers is very informative. A great place to lurk and learn. Amateur type questions are generally ignored so tread carefully.

Tropospheric Propagation - Tropo, receiving signals from distant towers or DXing. 

WAVELENGTH CALCULATOR

https://www.omnicalculator.com/physics/wavelength#wavelength-formul

DEEP THEORY

https://www.antenna-theory.com/m/index.php

ANTENNA GLOSSARY

http://www.hdtvprimer.com/ANTENNAS/GlossaryA.html

BALUN CALCULATOR 

https://www.basictables.com/amateur-radio/41-half-wave-coax-balun

MAXWELLS EQUATIONS

https://www.maxwells-equations.com/m/index.php