Dave,

Given that one of the big guns would probably have 15dB advantage on that
signal it might be worth monitoring reception until a peak is seen then
trying a CW call? Means staying up all night though!

CW would have been very ambitious under those conditions. QRSS3 or 10 might
have gotten the call sign through. My 3-second screen at that frequency is a
horrid mess of Loran lines and local interference, however. The slow speed
stuff has made the hobby possible in a location hardly suited for LF work.
Others more out in the country might do better.

John Andrews, W1TAG