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Matching is unquestionably in the category of loss, unless it is a 1/4 wave without need of a coil or an LC match. I do understand everything you have said and do not directly see pattern gain as the direct opposite of a coil or LC loss. However if you can get pattern gain, it is worth taking as gain is gain when it comes to effective DX antennas. Give me the lower angle peak gain each and every time, assuming there are no nulls above said angle.


It needs looking at holistically as a complete system. Wire length and matching devices are part of that system. They all relate to performance result. You can lose some energy as heat along the way, the less you lose the better. Using an ATU is an end user choice, as is a choice of antenna. Along with the losses an ATU causes.


It all adds up or subtracts from the overall antenna system performance.


I understand an ATU may provide great convenience, a small compromise for a lot of flexibility but they are still a lossy device in your antenna system. Each to their own choices.