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Well, DC itself doesn't carry a signal. We can impose a signal (information) on it, but that signal itself isn't DC. Wrapping your head around resonant circuits takes a bit more learning that can be passed on in a forum like this. It's fun stuff.

:mrgreen: Yep, that's what I said! AC works quite differently from DC. At resonant frequencies, it gets downright weird. That's what makes telecommunications possible. This can make it very difficult to get rid of unwanted induced voltages - what is a low impedance at one frequency may be...

There can be a number of different reasons for curves and loops. Sometimes it's tuning, more often it's for shaping the radiation pattern. Here's one that will torque your brain - picture a whip antenna with a spiral connected to the base of the radiator on one end and to the ground plane on...