This is the active HF, VLF antenna. 10 kHz to 30 MHz. You can hear antenna like this on websdr:

http://websdr.ewi.utwente.nl:8901/

Antenna and power feed unit (Full complect)!

The power feed unit made with  RF isolating transformer (last picture). This modification reduces the noise level and increases the S/N level.

BNC connectors for RF and RCA or 5.5x2.1 mm connector for power supply.

You need:

Up to 100 feet of RG-58 coax (or what ever your coax run is)

Power supply 12-15 V 100 mA