 
 <prompt> Wetin we need consider? Based on di last question, write something wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: For example, for 30 MHz (10 m wavelength) if true resonant 1⁄4-wavelength monopole suppose dey almost 2.5 meters long, and if you use antenna wey only 1.5 meters tall, you go need to add loading coil. Dem fit talk say the coil don lengthen the antenna to achieve electrical length of 2.5 meters. But the resistive impedance wey go result go dey lower pass the impedance of resonant monopole, and e fit need further impedance matching. Apart from lower radiation resistance, the reactance go dey higher as the antenna size dey reduce, and the resonant circuit wey the antenna and tuning coil form go get Q factor wey go rise and fit cause the bandwidth of the antenna to no dey enough for the signal wey dey transmitted. Na this major factor wey dey set the size of antennas for 1 MHz and lower frequencies. 