I currently have a vhf/uhf dual band base vertical that is 30ft to the bottom. I have it anchored into the facia board leading up to the eve of the house. I would like to install my soon to be arriving Sirio Gainmaster the same way on the other side of the eve. But i was wondering what the minimum spacing between the 2 that would be recommended. I really don't think i can pull off 40ft of mast as it would put too much of the mast above the anchor point. So i was thinking maybe drop the dual bander a few feet and add that few feet to the Gainmaster. I believe the dual band is 8ft tall. basically I'm asking what separation distance horizontally is recommended and if i can't get what is believed should be used if i can then make up for it by going higher over the top of the dual band?