At low frequencies (such as AM broadcast), arrays of vertical towers are used to achieve directionality  and they will occupy large areas of land. For reception, a long Beverage antenna can have significant directivity. For non directional portable use, a short vertical antenna or small loop antenna works well, with the main design challenge being that of impedance matching. With a vertical antenna a loading coil at the base of the antenna may be employed to cancel the reactive component of impedance; small loop antennas are tuned with parallel capacitors for this purpose.
At low frequencies ( such as AM broadcast ) , arrays of vertical towers are used to achieve directionality and they will occupy large areas of land . For reception , a long Beverage antenna can have significant directivity . For non directional portable use , a short vertical antenna or small loop antenna works well , with the main design challenge being that of impedance matching . With a vertical antenna a loading coil at the base of the antenna may be employed to cancel the reactive component of impedance ; small loop antennas are tuned with parallel capacitors for this purpose .
Why is this specific antenna type used?
Why is this specific antenna type used ?
achieve directionality
achieve directionality