Mini-Whip HF VLF Active RX Antenna 10kHz to 30MHz PCB DIY Electronic Module Kit - buy Mini-Whip HF VLF Active RX Antenna 10kHz to 30MHz PCB DIY Electronic Module Kit: prices, reviews
Simple and better circuit for MiniWhip antennas, as used in the Twente WebSDR
Patrick Skerrett on Twitter: "Just got my Russian version of the PA0RDT mini -whip broadband RX antenna. Thanks to RA0SMS via Ebay - https://t.co/s0vPDHjz7S" / Twitter
Amazon.com: Active Antenna HF LF VLF, Modern BF 998 Mini Whip Shortwave Portable VLF PCB Board Module for Communication : Electronics