I had the FG-01 antenna analyser with me so I thought I would take a look at the response of the commercial delta loop comms antenna. It's a travelling wave antenna which means it has a terminating resistor at the top of the mast. When I mentioned the insulators in the guy wires I didn't add there's no insulators between the mast and the guy wires. When masts are used as the radiating structure they have insulators between the mast and each guy wire. Unless they're top loaded, when the top guy wires will be connected to the mast.

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