I built this antenna according to a design by Gerhard, HB9ADF (Patent pending).
Equilateral Triangle Loop, Aluminium Profile 8 x 1mm, 1m side length,
suspended between two 3m Wires (20m Band) about 1.8m above Ground.
The ends of the suspension wires have to be folded back and twisted or shortened for 15, 12 and 10m.
75 pF Tuning Capacitor
Coupling loop with no galvanic connection to the magnetic loop
VSWR Curve, note 2:1 Bandwidth of 100kHz!
The 2:1 bandwidth would increase with better adjustment of the coupling loop to a VSWR near 1:1 (in the above diagram 1.56:1).
The loop without the capacitive load of the two suspension wires has a bandwith of less than 30kHz and the capacitor is arching at less than 5W!
The capacitive loads can be placed in the plane of the loop, as above, or in any direction, anywhere at the periphery of the loop.
...and that's how the antenna looks like, suspended under the roof of my terrace