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I'm looking for a visual representation of how a yagi-type antenna causes a disturbance in the electromagnetic field and whether that disturbance has different characteristics at different parts of the radio spectrum.

Pictures or video resources would be helpful. I would also accept a written description if it is clear and concise, but pictures, diagrams or video would be preferred.

As a side note: being quite new to the area, I'm not very fluent in the technical terminology.

Cheers