Correct me if I am wrong, but all RF light waves are created via a changing electric and magnetic field. But when looking at all kinds of radios and RF circuits, this light wave is always made with a simple wire antenna. Why are coils not used instead? Wouldn't a coil of the same length create a stronger magnetic field thereby creating a more efficient 'antenna' that produces RF waves?
I know that there has to be a reason why coils are not used, but I cannot find an explanation. It makes more sense to me to have a coil creating a fluxuating electric/ magnetic field rather than a piece of wire.
Thanks in advance!