 
 <prompt> Wetin dey make dem assume say antennas dey work like dat? Based on di last question, write one context wey go contain di answer. E fit be 1 - 20 sentences. Context: <response>: Resonant antennas dey expect make dem use around one particular resonant frequency; so antenna gats be built or ordered to match the frequency range of the intended application. One particular antenna design go get one particular feedpoint impedance. While this fit affect the choice of antenna, antenna impedance fit also be adapted to the desired impedance level of one system using one matching network while still maintaining the other characteristics (except say e fit lose efficiency). 