generate questions: 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.
For radio broadcast that one would hear in their car what type of towers are used? {sep_token} If one wished to take an antenna to different locations, which type would be best? {sep_token} Why is this specific antenna type used? {sep_token} What is a problem one might encounter when using a portable antenna?