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Mini Active Antenna VLF LF HF VHF Active Receive Antenna Kit with SMA Connector Cable 10kH to 30MH DC5‑13V 100mA for Radio High Stability Receiver : Amazon.co.uk: Electronics & Photo
303WA-2 Apex Radio Ricezione Antenna Esterna Installazione Tipo Am HF Bcl | eBay
7.2 Standard Types of Antennas - RF and Microwave Engineering: Fundamentals of Wireless Communications [Book] | Antennas, Communication book, Radio astronomy