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Advanced High-Frequency Radio Communications (Artech House Telecommunications Library): Johnson, Eric E., Ostergaard, Jens C., Cook, Stephen: 9780890068151: Amazon.com: Books
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The Ionosphere
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What's the difference between how HF and VHF/UHF radio waves travel? - Barrett Communications
The Ionosphere
U.S. Air Force selects BAE Systems' high frequency technology for radio modernization effort | BAE Systems
Harris Corporation Receives NSA Certification for RF-300H Wideband High Frequency Manpack Radio System | Business Wire
