90cm passive you-loop hoola-hop antenna, balun made with 140/43 toroid instead of ferrite rod, RG/213 cable, connections as shown in the photo: in the box one end of the cable is connected to the centre, the other to the centre and to ground as seen in Giuseppe's project "QrpRadioLstnr" which you can find on YouTube, the ground of the RG/213 cable where the connections are made with the leads must remain together. The RG/213 cable is inserted inside a rhythmic gymnastics hoop. The antenna works from the medium-wave frequencies up to the 10-metre short-wave band.
I have to say that the connection of a wire to the centre and ground (the you loop design involves connecting the wires to the two centres) and the use of the 140/43 toroid, as well as the diameter of the loop, is the key to being able to pick up stations in HF with low power.
I use it with my portable receivers, but with an SDR receiver, which I do not yet own, the results would be even better.
The windings you see in the photo were excessive, which made the antenna deaf on medium waves, I reduced them to six, resulting in better reception on short waves and finally being able to listen to medium-wave stations as well.
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