I’ve been wanting to try a different aerial for 20m for some time. I currently either use a dipole in the loft, or a temporary SOTAbeams linked dipole on a 7m fibreglass mast. The magnetic loop antenna appeals because it’s compact, and if designed/built for efficiency, gives excellent performance.

They’re also expensive. One well-known UK dealer is selling the Ciro Mazzoni baby loop for £1299; another dealer sells the MFJ-1782X for £439; the Chameleon CHA F-Loop is available from a third dealer for £399. All are far, far outside my budget.

It’s not called amateur radio for nothing, and what I describe in this series of articles is truly amateur. I’m going collate my research sources, and try building a magnetic loop antenna (properly called a small transmitting loop antenna) using bits from my junk box, making good use of the things that I find, things that the everyday folk leave behind. I don’t have all the parts, but whatever I need to buy must not break the bank. Similarly, tools: I’ll need some, but they must be cheap 🙂

(more…)