Found it in a cache you could only find after going through a dark tunnel under a very old castle. A fun cache to do, really !
The final location of the cache was right beside an antenna, so we took a picture of the TB with the antenna in the back.
I'm not sure I understand where this TB wants to go, so just in case I'll take it somewhere were technology is involved. Don't know where just yet, but I'll figure it out.