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The International Amateur Radio Union (IARU) home page.
The American Radio Relay League (ARRL) home page.
QRZ home page.
National Weather Service - Space Weather Prediction Center.
National Weather Service - Solar Cycle Progression.
Autralian Space Weather Agency.
Australian Space Weather Agency - Global HF Ionospheric Map.
Australian Space Weather Agency - HF Propagation Prediction Tools.
Australian Space Weather Agency - Space Weather Index.
SpaceWeather.com.
Visit Antenna - Theory .com's Antenna Fundamentals Page
NEC Antenna Modeling Software
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