BaL, Where's your 'base station' located....somewhere on the coast...?
I could tell you about an ELT reported by several aircraft just to the SE of Perth. Nobody could actually locate it.
It turned out to be in a boat being towed on a trailer - when the trailer hit a 'bump' it activated the beacon - apparently.
The vehicle was on a 'country road' on its way to Rockingham, S. of Perth, and moving at around 100km / hr, and over the course of an hour or so, it had moved from where it was first heard.......
A 'Good Result'...eventually....
Cheers