I have had a PC and laptop used for RA stuff running 24/7 for 3 months or so – the secret is using something like “Stop Updates 10”; it does what it says!
With regard to the antennas, two are show in my picture, shown against a pink sunrise. They are, to give them their full title, cross polarisation 3 element LFA (Loop Fed Array) Yagis (Red and Green systems). The antennas are completely separate electrically. They point vertically and the elements point 45 degrees either side of GRAVES bearing. They are very much an experimental arrangement and the idea is that because the patterns in this orientation are ( I believe) akin to a dipole (exact modelling or measurement is a problem ) there is some direction discrimination. The other antenna is a 2 element LFA in traditional horizontal polarization configuration (Blue system). I am fairly sure GRAVES transmits vertical – certainly their recieving array are verticals so that would account for the better performance.