My last towers set in 6 yards of re-barred concrete. Usually the antenna is more at risk than the tower. I've had a variety of HF antennas; Tri-bander +WARC, bandpass log periodic yagi, and Quads. The Quad is my favorite; the bandpass LPY was one feed line instant satisfaction. The story of the Quad is quite interesting also. [Towertalk] The Quad antenna was developed by HCJB Wire antennas work well; some offer low band gain and low angle of radiation. The pitch of a roof is a natural inverted V. These are great getting an antenna up a tree. http://www.wcerc.org/Projects/images/slingshot-antenna-helper-01.gif I use a sling shot and a fishing pole.