After my 80 meter HF loop antenna (SkyLoop) broke during high winds in 2025, aprox 30 meters of the loop antenna still is up and can be used as a random long wire antenna.
In Januari 2026 I connected an UNUN (DIY – maybe a 1:49, not sure…) to be able to tune the wire on all HF bands with my remote auto tuner RT-100.
I also added two counterpoise wires about 8 meters long to help reduce some common mode current on the coax and add better tuning possibility.
This is the NanoVNA SWR plot before the RT-100 tuner. The overall impedance is low so it should be better to use a different UNUN winding. But that will be some other time…
