Optibeam OB21-3 – largest 20-15-10m antenna

Optibeam just launched a set of 4 huge HF antennas, and the OB21-3 is definetely the one that caught my attention the most. It’s a 21 element HF beam, covering the 20, 15 and 10m bands; as some of you may know, Optibeam...

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