Reinhard Zwirner wrote:
Dear experts

I'm searching for a simple but good-working and reliable circuit
for a 10 kHz - 30 MHz active antenna. It would be very nice if
someone showed me a link to such a circuit.

TIA and a happy new year

Reinhard

A guy named Salvati has several articles in EDN etc on using
active antennas. Add his name in the google search.
IIRC, he used J310 JFETs to add the active portion of the
circuit.

Good luck,
Dave