I am not aware of any LORAN designs that did not use a preamp. Some of them
have the preamp buried in the base of the antenna, and some of them use a
short (24" or so) wire whip with the preamp box bolted onto the airframe
very near the bottom of the antenna. II Morrow old designs, for instance,
provide a 6" length of coax to go from the base of the antenna to the preamp
connector. As the author says, much more coax than this and the antenna
signal approaches zero.

Jim



"John_F" wrote in message
...

.. You can get away from using a pre amp
but you must use a MUCH longer antenna feeding the coax or you will
not have any signal left by the time it gets to the receiver because
of the antenna to coax impedance mismatch