perimeter detection system

Somewhat complicated circuit that uses 4 HBHF sensors (1 per direction for north, south, east, & west). It's technically possible to make this circuit much simpler by using XOR modules instead of using multiple AND & OR modules, as you only need 3 XOR modules & 1 AND module, but the problem with that circuit is that if both HBHF sensors attached to the same XOR module detect players at the same time then no power will pass through thus reducing the efficiency of the perimeter defence system. Quick note #1: this system is meant to be used in combination with an RF broadcaster & RF pager, but in this design I have used an RF receiver connected to 4 flashing lights as a substitute for the RF pager. Quick note #2: I was going to use an audio alarm speaker instead of the lights, but the audio alarm seems to spawn in the large hanging banner instead - a bug with fortify I guess? Quick note #3: if you have at least 4 turrets outside of your base - 1 per direction - then you can use the "has target" output of the turrets instead of hbhf sensors to output to RF transmitters instead of messing about with a load of complicated wiring.