Hey Mardy,
Hope Benny gets well soon! Cat lover myself!
We have had a few cats (over the many years) and at times they have had to have those collars too. But it never crossed my mind that I could have lined those buckets with some al-foil and stick a few wires to the cat and possibley receive some LGM signals whilst the cat was scanning the sky for birds!
Cheers and all the best for Benny.
Bartman