 
 <prompt> Wetin dey cause reactance of 5%? Based on di last question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Instead, e dey often make sense to get antenna wey e impedance no dey change too much over certain bandwidth. E come be say di amount of reactance wey you go see for di terminals of a resonant antenna when di frequency dey shift, like by 5%, dey depend well well on di diameter of di conductor wey dem use. A long thin wire wey dem use as half-wave dipole (or quarter wave monopole) go get reactance wey dey significantly pass di resistive impedance wey e get for resonance, wey go cause poor match and generally unacceptable performance. If dem make di element using tube wey get diameter wey be like 1/50 of e length, e go result in reactance for dis changed frequency wey no go too much, and e go reduce di mismatch wey go only small-small spoil di antenna net performance. So, na thick tubes dem dey typically use for di solid elements of such antennas, including Yagi-Uda arrays. 