[paulsherwin]

Thanks for the googling advice Jim, that did indeed find more useful hits than my previous searches. I never knew that Americans call ferrite rod aerials 'loopsticks', but I guess this is common knowledge for any radio amateur.

I didn't find precisely what I was looking for, though. I'll have another look tomorrow after a night's sleep!

The idea is to build something in a small plastic / wood box which can sit on top of or behind an old radio unobtrusively and be plugged into the aerial and earth sockets. A non-ferrite tuned loop would be a bit big.

Best regards, Paul