Why do we need coaxial cables for TV signal transmission, what would happen if we would just use a „normal“ cable instead?
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I am not sure why this question is being down-voted.
If somebody thinks that this is an obvious question, consider that computer networks started with using [thick coaxial cable for wiring](https://en.wikipedia.org/wiki/10BASE5), then gradually moved to cheaper thinner coaxial cable, and eventually to the [cable made from twisted pairs of wires](https://en.wikipedia.org/wiki/Twisted_pair), which is not too far from what the OP may call “normal” cable — though it is much more carefully made than electric cords for appliances. (Note that modern computer networking cables work at similar frequencies to those used for TV transmission.)
This shows that despite its many excellent features, coaxial cable is not preferred for all applications. There is really no simple, clear-cut answer to the OP’s question, even though many things that have already being mentioned in the comments — regarding low interference, controlled impedance, availability of tools and connectors to work with coaxial cables — are all true. These factors all contribute to its popularity in many, many applications.
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