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Here some details:
The feedpoint is a 50 Ohm coax connector fixed with two brass screws M3.
! Avoid to use magnetic materials as steel iron etc. for building magnetic loop antennas!
Use only aluminum, brass, stainles steel, copper...
Iron etc. will make losses.
The "gamma" match.
This kind of antennas work fine with SDR receivers. Antenna's small bandwidth gives good preselection for the SDR.
Loop diameter is 45cm.