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When trying to benchmark open-wire feedline for loss, it becomes a little more difficult.

Since most inline wattmeter's are 50 ohms, placing a wattmeter would have to be placed ahead of an impedance matching network matching 50 ohms to 600 ohms and the another network matching 600 ohms back to 50 ohms again? Correct?

Of course the loss in the matching networks would also have to be known.

The other concern is having the ability to easily verify if the feedline currents in an open-wire feedline are 180 degrees out of phase, minimizing any feedline radiation. Thanks for any help here.