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. COUNT 4
QSN1 For radio broadcast that one would hear in their car what type of towers are used? ANS1 vertical QSN2 If one wished to take an antenna to different locations, which type would be best? ANS2 short vertical antenna QSN3 Why is this specific antenna type used? ANS3 achieve directionality QSN4 What is a problem one might encounter when using a portable antenna? ANS4 impedance matching