Power radiated from a linear antenna is directly proportional to square of antenna length.

Power radiated decreases with increasing frequency.

Antenna should have a size comparable to the wavelength of the signal.

Effective power radiated by a long wavelength base band signal is small.

$540-1600 \mathrm{kHz}$

$88-108 \mathrm{MHz}$

$800-900 \mathrm{MHz}$

$3.7-4.2 \mathrm{GHz}$

2.0 MHz

1.5 MHz

2.5 MHz

3.0 MHz

$640 \pi \times 10^6 \mathrm{~m}^2$

$512 \pi \times 10^6 \mathrm{~m}^2$

$480 \pi \times 10^6 \mathrm{~m}^2$

$440 \pi \times 10^6 \mathrm{~m}^2$