When I lived in Chicago, my two story house was on a small lot, and the
house were close together. So there was no room for anything except a
vertical. The easiest way was for me to attach it to the chimney. My
antenna was a Butternut HF6V that was around 30' long. I don't remember
exactly how long. Anyway, I went to Radio Shack and got this kit for
attaching to the chimney. It had two ratchet mechinisms that had straps
attached. I put one on the chimney, just above the roof about 6". The
other was put almost at the top. The straps went around the chimney sides
and back in the ratchet and then you tightened it. Then you slipped the
vertical in the two supports and tightened.

I had that vertical up in snow and ice storms and never had any problems. I
couldn't have put beams up because they would have stuck over the property
line and over my neighbor's roof, which wouldn't have gone over very well.

Anyway, that's one thing that worked.