Antenna theory it seems is always described assuming that the transmitted or received signal being talked about is a pure sine wave usually at the resonant frequency. Standing waves for example are always depicted as perfect sine waves.
So everyone gets the impression that the waveforms on our antennas and transmission lines are all perfect sine waves.
However, it seems to me that the signals on an antenna including standing waves are hardly ever a perfect sine wave and are usually not exactly at the resonant frequency. For example, an LSB voice signal does not look like a perfect sine wave at all.
Do antennas work differently for perfect sine waves than for the far more usual messy looking waveforms i see on my oscilloscope ?