Here is a question from QRZ ham radio trivia: If an antenna is to be an efficient radiator, it must be resonant at the operating frequency True False Answer 2, "False" is Correct! As long as you can obtain a proper match to the antenna through a matching network power will flow and the antenna will radiate efficiently no matter how far off resonance it's physical length may be. Can someone help me understand this question.... I understand that if the radio "sees" a good match it will have full output, wether it's an antenna or a wet fish on the kitchin counter. but how in the world does a matching network cause the antenna to be efficient radiator ? It's my understanding a matching network changes what the radio sees looking out. So I believe this question to be incorrect, in that a non-resonant antenna will not resonate as well as a resonant antenna. therefore I beleve it to be true that "If an antenna is to be a more efficient radiator, it must be resonant at the operating frequency" So a matching network will cause the radio have a full output, but still into a poor match, and non-efficient radiator. let me try this again: 2 antennas, no tuner. ant A is cut for 3.5mhz, ant B is cut for 4mhz. If I operate at 3.5mhz, ant A will radiate more efficiently than ant B. I see this as: To be an efficient radiator, ant must be resonant at operating frequency. I know that my radio will "fold back" power with poor swr. A tuner will fool the radio to make it think it sees a good match, and thus have full power into a poor match, and poor radiator. What do you think ? help me understand... Dan kb7uxe.