Next to my soccer field, some moron has occasionally been letting off homemade fireworks at night for over 15 years and has never been caught.

I know that I would love to catch whoever it is because, aside from being annoying, there is the risk of fire and, I think that much of the neighbourhood would like to catch them also and so, when someone acts a little bit out of the ordinary near the "bang" sites, people take notice.

The radio that I use is a tiny $AU18 model with two "C" cells plugged into its external battery socket and a great big 8" ferrite rod and winding glued to its top.  It sits on top of a ferrite coupler which is attached to the dipole.  I think that the combination of technology looks so alien to the general public that they would never get the idea that it is just a radio and they will accept the seismo explanation.