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Compact spiral T/R HF antenna

Compact spiral T/R HF antenna
This is a short, efficient, horizontal indoor spiral transmitting / receiving antenna, using 139 feet (approx. 42 m), that can be compacted into a length of about 15 feet (approx. 3 m). It is based on a pair of Slinkys. And, quite reasonably, you may ask "and what on earth is a Slinky?"
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