James Moritz wrote:

I think the role of the ground with active whips is often neglected - the output of the whip preamp is the voltage differential between the whip element and the circuit ground, so the ground connection is just as much part of the antenna as the whip element itself is. Clearly, an electrically quiet ground is needed for the active whip, whether this is provided by the coax feeder or a separate local ground connection.

Dex