On the controller by the RJ45 jack is a ground block. Just one ground. Controller only. Don't ground any other points. Make sure it's a good 'cold water' or earth ground. The controller ground is common to all the components in the system from that one connection. Assuming you've used shielded CA5/6 cable.
5 Feet is probably still too close to the computer... get those antennas and amps as far away as possible... 10m or so
5 Feet is probably still too close to the computer... get those antennas and amps as far away as possible... 10m or so