Extra exam question E9D10

WhyA base-fed whip antenna's radiation resistance decreases below its resonant frequency. A base-fed whip antenna's radiation resistance decreases as operating frequency drops below its resonant frequency, since the antenna becomes electrically shorter relative to a wavelength at lower frequencies, and radiation resistance generally falls as an antenna's electrical length shrinks, answer B. Radiation resistance doesn't increase below resonance, doesn't become imaginary (imaginary components describe reactance, not resistance), and it does depend on frequency, it isn't a fixed, frequency-independent value.