A 2-m-long center-fed dipole antenna operates in the AM broadcast band at 1 MHz. The dipole is

Question:

A 2-m-long center-fed dipole antenna operates in the AM broadcast band at 1 MHz. The dipole is made of copper wire with a radius of 1 mm.
(a) Determine the radiation efficiency of the antenna.
(b) What is the antenna gain in dB?
(c) What antenna current is required so that the antenna would radiate 80 W, and how much power will the generator have to supply to the antenna?