In the case of a LORAN receiver, over load is not a serious matter. The
receiver only has to decide
if a signal is there or not. The LORAN is a pulsed signal and you only
have to detect timing of the pulses.
If the receiver limits strong signals and does not lose sensitivity you
should be OK
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Strong sigs can be limited simply by connecting 2 diodes (cross polarity)
across input of receiver.
Using general purpose Si-diodes limits V(peak) to approx 700 mV ,Schottky
diodes to approx 300 mV.

Frank GM0CSZ / KN6WH