The Circuit
All the work I’ve done with this VPA is based on the PA0DRT Mini Whip design and I claim no originality for the circuit or, indeed, the format of the system. It looks like a two-stage amplifier with its input connected to a very small antenna element and its output to a receiver. For convenience the DC supply to the active components may be fed through the feedline (Typically coax) or by a separate LT circuit.
The circuit with which I began is shown here
