Performance evaluation by the change of the shape of 1/4λ (20m) whip antennas of the 3.5, 3.8MHz zone which assumed a car a pillow

Abstract

Radio wave in HF band (3.5, 3.8MHz) repeats refractions and reflections between the ground and the ionosphere. So it is possible to long range wireless communication. We made inexpensive and movable 1/4λ whip antennas for use in an emergency. This paper reports performance evaluation by changes shape of 1/4λ whip antennas.