I recently looked into a project not too dissimilar (in security terms) to a strip.
It's very easy and cheap to set up cameras, with software which detects movement, and emails images of such to a predefined email address. If there is no ADSL (no phone line available) this can be done with GSM (GPRS/3G).
Lots of people complain about hangar rash but, even for a hangar containing 7 digits worth of planes, they have not spent £3000 on a fairly basic system taking regular images of the hangar interior and optionally emailing them out.
Even the cheapest CCTV/recorder system would stop hangar-rash because you could play it back and see who did it.
Securing a totally remote strip is not that hard. Somebody will 'always' be able to break into the building before anybody can get there (burglars/vandals tend to ignore the visible part of alarm system because they know the minimum time before somebody could possibly turn up) but they will get caught because you will have them on a concealed video.
But if your stuff gets nicked from a hangar, the culprit is most likely very close to home...