This loop antenna is based on one published in one of back issues of sprat by DL1HCU. It worked well with QRP power from 20-10 metres, including WARC bands. The tuning capacitor is twin gang type salvaged from old radio.
The foldaway loop antenna represents one of amateur radio’s most ingenious space-saving designs, offering impressive performance in a remarkably compact package. This diamond-shaped antenna system demonstrates how creative engineering can solve the perennial problem faced by radio operators with limited space or those requiring portable setups.
The beauty of this design lies in its collapsible nature and efficient use of materials. When deployed, the antenna forms a large loop that provides excellent radiation characteristics across multiple frequency bands. The tuning capacitor at the top allows for precise frequency adjustment, while the gamma match system ensures optimal impedance matching to standard 50-ohm coaxial cable. The hinged construction enables the entire structure to fold flat for storage or transport, making it ideal for temporary installations or operators who must frequently relocate their equipment.
What makes this antenna particularly appealing is its versatility. The large loop configuration provides low-angle radiation patterns excellent for long-distance communication, while the adjustable matching network accommodates various frequency bands. Modern builders can enhance the original design with weather-resistant materials and improved hardware, creating a reliable antenna system that bridges classic engineering principles with contemporary amateur radio needs. This timeless design continues to prove that sometimes the most elegant solutions are also the most practical.
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