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Currents and fields all add vectorially. Superposition is a principle which works so how can you say "they don't add up in the same way"? For two sources of the same frequency, in your EM version, you can expect the fields to add up, according to the relative amplitudes, phases and Field vectors.
In this case, you will not be able to catch a radio program, because you will catch a resultant of composed individual waves.
It is necessary for some people to start reading some books about logic.
Luxembourg effect. Some engineers doubt it exists. HARRP is studying it.
It is fundamental from Maxwells equations that electromagnetic waves to not propagate within a material with a significant amount of conductivity they just attenuate and decay exponentially.
Does a direct current flow only at the surface of conductor?