The internet does know all.

The train of thought: listening to a tune called "The Wild Geese" on a Chieftains album (The Celtic Harp: A tribute to Edward Bunting), I recalled that my mom liked a tune that she called "The Wild Geese" but was, in fact, a theme from an Australian limited series from the seventies. All that I could remember was the basic idea of the show, Australian convicts; the general time, late seventies; and that "Wild Geese" was not the name of the tune

I started with imdb, and after a few false starts, searched 'filming locations' on the keyword Australia. I didn't have much hope for this, expecting an unmanageable number of returns and I was right, but scanning the years (which were thankfully included) "Against the Wind, 1978" popped right out. It was a short trip to this episode guide which led quickly to this bio of the composer and astoundingly, to an in-stock CD at Amazon.

This tune was a big hit at the time. Must have been on the same charts as Paul McCartney's Mull of Kintyre.