practice Holding
Low power radio stations are still radiating on MW, can be used safely, and legally for practice NDB holds.
More remote VOR sites can also be used, (but beware the passing traffic).
In my day I used LGW for practice ILS, (FOC)...... but that was before the invention of traffic at LGW.
MS FS is a very good tool to practice holds, and almost FOC.
Not such a stupid answer to a stupid question, I hope.
glf