Ten years ago, I installed a dish on top of the USA Today building using a mast made of three pieces of 6" I.D. schedule 120 pipe. This was done on the first day that I worked for the now defunct, Peake Communications.
Unfortunately, the "engineers" who designed this mount made two errors. The first was, they actually thought that we could snug the three pieces together by tightening the nuts on the 3/4" bolts that went through them, which was ludicrous, but second, the 6" I.D. masting was ordered by someone who had measured the "can" on the dish (probably a Patriot 3.7 meter) and who had done a lot of electrical contracting but didn't realize that while electrical conduit size is determined by its outer diameter, water pipe is measured by its inner diameter.
We had to first bring the top length of mast back to the fabricator to have him weld a foot long extension onto the end of it, and then, after the assembly was completed (including a 25 floor "I" beam for lateral support) the welder had to come to the site and weld the three mast sections together so that they didn't wiggle.
Believe it or not, this was not the biggest fiasco involving that installation company. They once delivered a 30' dish to the top of a tall building using a helicopter. But they didn't have it dropped off on staging that could then be gradually lowered. They basically tried to get the pilot to hit a bullseye that would enable them to slide the pivot rod through the mount and the dish backplane hole.
They somehow succeeded. I have seen the photographs on the wall. But I can't imagine how. I also worked with them when they installed a 4.5 meter Andrew dish on the ABC news building on Decatur Street in downtown DC. When they told me where to stand to guide the dish as it was being raised by a crane from seven stories below, I told them that any idiot could see that the dish wasn't going to swing the way that they hoped and that the six of us would be unable to control it, and I refused to further assist them. About two minutes later, they smashed the edge of this $26,000, precision made reflector into the roof, without my participation.
I did do them one small favor after that. I called Andrew and ordered a gallon of touch-up paint so that the damage to the reflector wouldn't be quite so obvious. Andrew sells a touch-up kit for that dish that included a gallon of white paint, a little red paint to match that of their logo, and some silicone resin to glue the heater elements back on if necessary. The kit cost $600.
The happy ending to all of this is that they subsequently went bankrupt and I went into business for myself and picked up about half of their old customers.