If you go back a couple more decades or so, to when I started teaching the IMC rating it was even easier, as the Droitwich frequency was 200 kHz which made it a really useful training aid for ADF tracking exercises. It was changed in 1988 to the current 198 kHz which made it harder with “modern” ADF receivers, as you could still get them to point at it but couldn’t really make out the speech so well so harder to “ident”....