I think the 55 gallon drum for anchros is a bit overkill, but I am sure they will never come out of the ground. Obvioulsy, it depends on the soil type. I used 3' screw in earth anchors, I welded several 12" lengths of rebar to the anchor. The screw in auger things serves no purpose other than to grip the 160 pounds of concrete I put in each hole. I added a bit more reinforcement and concrete to the anchor that I use to pull my ginpole. I have trouble lowering my tower because my anchors are lower than the pivot point on my tower base. I actually added two new anchors further from my pivot pin, but that did not help. I then busted up a couple inches of the conctete and cut the loop below ground level. I didn't even think about doing a destructive load test to see just how strong this type of anchor is. If I were to do it over, I would have welded another 18 inches of rebar to make my anchor 48", and left enough sticking out fo the ground to be higher than my pivot point. This would also put me below the frost line. I am not sure if frost heaving will play a role here or not, could make my guy wires go limp. I usually do a weekly inspection on all guy connections, which reminds me, better get out there. As for having only two sets of guys for a 60 ft tower, I too would think you will want one set at each coupler. The tower is going to skew a bit at each coupler, you will need to compensate bu adjusting the tension on the guy wires to make it look straight. I use turnbuckles to adjust the tension. Not sure what you guys use for turnbuckles, but I bought the heaviest thing I could get at the Tractor Supply, $26 bucks each x 8. By turnbuckles are by far the weakest link and will fail before my anchor will. I run an extra length of 1/4" cable through the anchor length, through the turnbuckles to keep it from loosening, through the cable thimble of the guy wire, and back as a safety cable in the event of a turnbuckle failure. Good luck and let us know how it turns out.