Active Antenna, 10 KHz - 30 MHz Mini Active Antenna with Cable, Portable Digital Active Antenna for Radio Communication : Amazon.com.be: Everything Else
The Difference Between Passive and Active Antennas
Active antenna for a shortwave radio (schematic with N-FET) - YouTube
PDF] Active Antennas : The Next Step in Radio and Antenna Evolution | Semantic Scholar
Understanding the Difference, and Debunking the Myths, Between Active and Passive Antennas