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Just a quick one but i have tried something similar and was informed that if you have multiple sets of wireless cameras then their signals could interfere with each other. I don't know what the wireless frequencies are in Scandinavia but if its similar to the UK then there are four variations to the 2.4Ghz supplied in each pack and each pack will have the same frequencies. The other thing about wireless cameras is that they generally don't have the range that is advertised and are affected by local conditions (Building materials, Television/Satellite signals, WLANS and strong electrical signals, overhead power lines and trains etc). Sorry to put a downer on your situation but hard wired cameras give a better image and you 'Know' that you will get an image recorded. Good quality (1/3" HAD CCD) covert cameras on the roof could provide the imagery whilst as mts said, a Couple of dummies could bottleneck the offenders. Hope this helps
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