UPDATE: OK guys. Additional external antennas mounted and tests run and the results??? Exactly the same performance! It hasn't made ANY difference what so ever. I suspect because my preferred band is 1800mhz, and the router won't do 1800mhz across all 4, and even if it did, I'm probably saturating what the tower is capable of providing me on 1800mhz. Ill confirm this by going for a drive to the tower and doing some further speed testing. If it's about what I'm getting now, then I won't do any further work on this box, if it's a lot faster, we'll I might just look at putting some parabolic antennas up, 20dbi bad boys tuned at 1800mhz. I'll see. Overall I'm still very happy with my results. I've been able to archive 75mbps/25mbps during peak times, and 120mbps/35mbps off-peak. Am obvious huge improvement over the dsl connection I was on. Given I have 2 sim cards (2 plans to make up the 400gb) I could look at a router that bonds the connections, but not sure what's available here and what prices are like. I'd love a cradle point or something, but wowsers are they expensive!