http://www.simonsdialogs.com/wp-content/uploads/2014
/12/dcf77-input.jpg

A loopstick antenna is connected directly to a JFET preamp, which in
turn feeds the BC546 common base stage. Despite the neat use of a normal
coax to power the input stage and to extract the input signal, how is
this arrangement better than just a receiver-side resistor to +12V
or a DC coupled PNP CE stage? At 77kHz I see no obvious benefits
(wider bandwidth, better in/out isolation) of the cascode. The drawback
is the necessity of a high voltage power supply (which could be
circumvented by a folded cascode).

Best regards, Piotr