Origami-01

That is the simplest broadband multi-loop I was able to invent.

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Origami-02

Adding two wires reduces SWR to 2.5:1 max. at the feed point. So, this is another antenna suitable for a transceiver without an antenna tuning unit.

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Cat Whiskers

This is a modification of Origami-02. Thanks to the lower position of the feed point in the antenna frame, it is easier to mount the Cat Whiskers on a mast. 

I have constructed and measured this antenna. You can find its construction details, measurement results and performance evaluation in the menu item "Broadband HF Antennas" \ "Cat Whiskers".

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Multi-Loop Doublet

This is the shortest of the broadband antennas. This compact antenna is based on a dipole-like construction with X-shaped structures at the ends of the main radiator. These parts are shown in gray in the drawing below. Rectangular wire frames (blue wires) are attached to the X-shape supports. The corners of the frame are connected to the corresponding corners of the opposite frame (with brown wires). From every horizontal wire of the blue frame, four wires go to the feed point terminal (red and green wires). Due to its smaller size than the previously described broadband antennas, its gain is slightly lower. It is a (small) price for the size reduction. 

I have constructed, measured and used this antenna. You can find more construction details of this antenna in the menu item "Broadband HF Antennas" \ "Multi-Loop Doublet".

Click here to download this antenna models.