I've had the ATS/8 Arachnid for a while now and I always noticed a significant bonus to damage drop-off range when using it, but people all over the forums would tell you that the perk does nothing but increase the zoom distance. This video, however, proves that the Arachnid Sensorium perk not only offers additional range, but that it offers more range than the Over the Horizon perk would normally. So there. Case closed, it's been proven. To many including myself there wasn't any doubt to begin with, but some were extremely stubborn over the topic and decided to blindly deny all claims without putting any effort into performing their own tests.