I read an article stating that one cannot feed the dipole at the end with only one wire of the feed line. For example when using "ladder line" both wires need to be terminated. The argument was that there is a need for physical path. Now my question is - how can this explanation be applied to simple center fed dipole. Is is not that the "gap" of the center insulator "circuit" is completed via EMF? So why same does not apply to end fed dipole? In theory , the antenna circuit should also complete via EMF.