Complex sentence: The most common type of antennas rely on the concept of "resonance"; conductors, normally metal wires or rods, are cut to a length so that the desired radio signal will create a standing wave of electrical current within them.
Split into simpler sentences: The most common type of antennas rely on the concept of "resonance". Conductors, normally metal wires or rods, are cut to a length so that the desired radio signal will create a standing wave of electrical current within them.