Radio waves are created from electrons accelerated synchronously and all in the same direction. (1)

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Presumtion: Radio waves are made up of polarised photons. ↓11↓

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The electric field component of the radio wave is periodically aligned parallel and antiparallel to the antenna rod.

The magnetic field component is aligned perpendicular to the antenna rod.

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TL;DR Direction of the E and B field components of a radio wave

TL;DR Periodicity of photon emission

(1) In contrast to radio waves, thermal radiation originates from electrons that are excited in different ways. Thermal radiation has no wave properties and is not polarised.