As the antenna generates electromagnetic waves, there are simultaneous oscillating electric (E) and magnetic (B) fields created perpendicular to each other and to the direction of wave propagation.
EM waves are transverse, meaning that the electric and magnetic fields oscillate perpendicular to the direction of wave propagation. This transverse nature enables them to travel through space.
The generated EM waves propagate outward from the antenna at the speed of light. The wave consists of electric and magnetic field lines that travel in a continuous, sinusoidal pattern.
The wavelength of the EM wave is determined by the frequency of the oscillating current in the antenna. Higher frequencies result in shorter wavelengths, and vice versa.