Which of the following describes a type of antenna loading?
Electrically lengthening by inserting inductors in radiating elements✓Bonne réponse
Inserting a resistor in the radiating portion of the antenna to make it resonant
Installing a spring in the base of a mobile vertical antenna to make it more flexible
Strengthening the radiating elements of a beam antenna to better resist wind damage
Explication
Loading means adding reactance so that a physically short antenna behaves electrically like a longer, resonant one, and inductors placed in the radiating elements do exactly that. A resistor would waste power rather than tune the antenna, and a mechanical spring or stronger element is not electrical loading.