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1. If you are using the single-element whip directly attached to the Rangemaster, it would be best to have your radial system center directly below the transmitter, so the radials would be elevated if you mast-mount the transmitter. You can slant the radials down from the center and secure them to the roof near the edge.
2. The radials should be at least 3 meters long, and preferably as long as possible. There is nothing that says that the radials must all be the same length, although if you have a rectangular roof, with the transmitter centered on it and all radials brought out to the roof edge, this might give you a slightly “squished” radiation pattern, with the signal a bit stronger in the directions of the “long” radials.
3. If you look at the radial diagram for the Rangemaster, I think it indicates 64 radials, each of #12 wire, attached to the center ring of #4 wire. If you can’t put up 64 radials, put up as many as you can. Generally, the more radials, the better the ground system. There is also nothing that says you have to attach all the radials at once. I would recommend no fewer than eight radials, preferably sixteen, to start with. You can add more later and have your listeners comment on any change in your signal.
Hope this helps.