Excellent info Terry. I am using a similar arrangement for LW signal
enhancement but plan to take some ideas from the designs you presented.
I use a heavily modified Grove Tune 3 passive preselector. I have
modified the LW/MW coils and employed better output impedance matching.
I am presently experimenting with an old Ralph Burhans LW preamp
circuit with input low pass filter which works very well also. I am
finding that the whole trick to LW reception with an end fed wire
antenna (assuming the wire is at least 120' or more) is the impedance
matching to the coax (so what else is new!!!) since the antenna is in
the tens of K ohms at LW. A significant improvement in reception is
realized if the antenna is 250 feet long and of course if you can get
more than this it's even better. When I was in S. CA I had two 1/2
mile long wire antennas that stretched over bushes and the ground into
the local national forest. LW reception was utterly phenomenal,
however, the wires were directional primarily off the ends (Beverage
effect?), hence I had one running N/S and one E/W. Since my lot here is
only 1 acre I must suffice with 250 feet. I am, however, seriously
eyeing the nearby wash as a possibility. I'm also considering a large
horizontal wire loop around the property lying on the ground. Any
comments on the latter idea would be appreciated.

Frank