I made an 8 foot by 8 foot frame out of 2x2s. The frame hangs over the peak of the roof and supports several antennas mounted on masts attached to the frame. The antennas are placed such that lowest antenna still peaks over the top of the roof but the frame itself is mostly invisible from the street. The frame is made out of 2x2 x 8' vinyl imitation wood pieces. The frame has been on my roof since 2008.
I have several antennas hanging from ropes in the trees including two tri-band verticals, a 3 element 6m yagi, and several wire antennas.
This photos shows the rooftop antennas as well as the 6m horizontal yagi hanging from a tree behind and left of the house. (far left in image) See below for a close-up of the 6m yagi.
This photo shows the vinyl frame supporting the antennas.
Better photo of the 3 yagis and MFJ 1532N triband vertical. The yagis are, from top to bottom,