 
 <prompt> Wetin gain represent? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Antennas get different performance measures wey pesin fit dey reason wen e wan select or design antenna for one particular use. The main ones dey relate to the direction wey the antenna dey face (as shown for the antenna radiation pattern) and the gain wey result from am. Even for antennas wey dey omni-directional (or weakly directional), the gain fit still increase if more power dey focused for the horizontal directions, even if e mean say power wey dey radiate go sky and ground go reduce. The antenna power gain (or just "gain") also dey consider the antenna efficiency, and e dey often the main figure wey dem dey look out for. 