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A Two Dollar Helical HF Portable Antenna
Figure 3.1 from Design small size of High Frequency (HF) helical antenna | Semantic Scholar
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A two dollar helical hf portable antenna - Resource Detail - The DXZone.com
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A Two Dollar Helical HF Portable Antenna
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HELIX-70 Helix antenna 432 MHz, 7 turns
Helical Antenna
K6MM 160 Meter Vertical - A Restricted Space Helical Vertical!
