My airfield has a number of Rotax powered aircraft. It also has eight cameras running 24/7. All linked to a telephone alarm. Add to that the movement triggered lighting after dark and we sleep soundly. Some nice photos of startled deer and foxes.
Simple cameras can be bought quite cheaply. I'm surprised at the lack of them at so many airfields. Multiple engines stolen, and not so much as a number plate to go on.
A quick Google found this.
https://www.amazon.co.uk/KARE-Record...6025062&sr=1-5
If there's no mains power, there are plenty that work from a car battery.
Wireless Camera System 12v - Lightinthebox.com