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They sent me a PDF of the owners manual for the off air pickup that includes a schematic. It has around 40 components, and looks more involved than I’d care to proto-board together.
I did get a response from them a little while ago, suggesting:
“You *might* be able to use a sort-of current transformer – or capacitive coupling. If you wrap a few turns of wire around the antenna, near or at the base, you might achieve enough coupling. Try a 5 turn loop – one end of the loop to the inner conductor, the other to the shield of the cable feeding the mod monitor RF pickup, or connect to the pickup directly. I’ve never tried this – it may or may not work.”
If the weather is decent I’ll give that a go this weekend and post the result…