I'm working on my second iteration of a quadrafilar helix antenna used for our Field Day satellite operations. One thing that has been particularly tricky has been to drill through 1.5" PVC with holes that are truly perpendicular to a line marked on the pipe. And with a string of 4 holes, each 90 degrees from each other, it has been a challenge.

Any good ideas on pulling this off? I have a decent drill-press, but so far this task hasn't been to the precision required to get the antenna just right. It is going to be even more critical on the 430MHz version of the beast.

--NCR