Has anyone used a stealth camera with remote sensor? If so do you have any recommendations. I want it for capturing video of persons that should not be where they are; but I cannot put a camera close to the location because it is likely to be stolen.

I have found with my litl acorns that the long distant image is very good during the day and will provide details of number plates etc if I zoom into the image, but just need something to trigger it from afar. Any ideas/recommendations at reasonable price?